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GCSE Biology Graph Skill - 13 Pedigree Charts
This resource covers a key graph skill for GCSE Biology. The skill covered is Pedigree Charts which is needed in Topic 13 Reproduction.
Included:
Graph skills summary checklist
Information page explaining the Graph skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all graph skills here:
https://www.tes.com/teaching-resource/gcse-biology-graph-skills-bundle-13105264
All individual Biology Graph skills for GCSE Biology can be found below:
1.1 Variables and Axes
1.2 Intercepts
2 Line of Best Fit
3 Gradients
4 Trends
5 Types of Data
6 Pie Charts
7 Scatter Graphs
8 Line Graphs
9 Bar Charts
10 Ray Diagrams
11 Glucose Graphs
12 Menstrual Graphs
13 Pedigree Charts
14 Histograms
15 Evolutionary Trees
16 y = mx + c
17 Predator-Prey Graph
18 Pyramids of Biomass
GCSE Biology Maths Skill - 11 Standard Form
This resource covers a key maths skill for GCSE Biology. The skill covered is Standard Form which is used in Topic 11 Hormonal Coordination.
Included:
Maths skills summary checklist
Information page explaining the maths skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all maths skills here:
https://www.tes.com/teaching-resource/gcse-biology-maths-skills-bundle-13097376
All individual Biology Maths skills for GCSE Biology can be found below:
1.1 Units and Magnification
1.2 Surface area to Volume ratio
2 Cell Cycle Length
3 Rate of Reaction
4 Orders of Magnitude
5 Bacterial Populations
6 Percentage Change
7 Significant Figures and Decimal Places
8 Inverse Square Law
9 Averages
10 Tables
11 Standard Form
12 Ratio, Percentage, Probability, Fraction
13 Punnett Squares
14 Frequency Density
15 Areas of Shapes
16 Population size
17 Equations and Symbols
18 Biomass Transfers
GCSE Biology Graph Skill - 2 Line of Best Fit
This resource covers a key graph skill for GCSE Biology. The skill covered is Line of Best Fit which can be taught in Topic 2 Cell Division
Included:
Graph skills summary checklist
Information page explaining the Graph skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all graph skills here:
https://www.tes.com/teaching-resource/gcse-biology-graph-skills-bundle-13105264
All individual Biology Graph skills for GCSE Biology can be found below:
1.1 Variables and Axes
1.2 Intercepts
2 Line of Best Fit
3 Gradients
4 Trends
5 Types of Data
6 Pie Charts
7 Scatter Graphs
8 Line Graphs
9 Bar Charts
10 Ray Diagrams
11 Glucose Graphs
12 Menstrual Graphs
13 Pedigree Charts
14 Histograms
15 Evolutionary Trees
16 y = mx + c
17 Predator-Prey Graph
18 Pyramids of Biomass
GCSE Biology Graph Skill - 4 Trends
This resource covers a key graph skill for GCSE Biology. The skill covered is Trends which can be taught in Topic 4 Organising Animals and Plants.
Included:
Graph skills summary checklist
Information page explaining the Graph skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all graph skills here:
https://www.tes.com/teaching-resource/gcse-biology-graph-skills-bundle-13105264
All individual Biology Graph skills for GCSE Biology can be found below:
1.1 Variables and Axes
1.2 Intercepts
2 Line of Best Fit
3 Gradients
4 Trends
5 Types of Data
6 Pie Charts
7 Scatter Graphs
8 Line Graphs
9 Bar Charts
10 Ray Diagrams
11 Glucose Graphs
12 Menstrual Graphs
13 Pedigree Charts
14 Histograms
15 Evolutionary Trees
16 y = mx + c
17 Predator-Prey Graph
18 Pyramids of Biomass
GCSE Biology Practical - 4 Food Tests
This resource covers a Required Practical for GCSE Biology of Food Tests which is taught in Topic 3 Organisation and Digestion
Included:
Biology Practicals summary checklist
Information page explaining the practical
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology. Skill is also applicable in other exam boards such as Edexcel and OCR.
A bundle containing all practicals can be found here:
https://www.tes.com/teaching-resource/gcse-biology-practicals-bundle-13143873
All individual Biology Practicals for GCSE Biology can be found below:
1 Microscopy (Required Practical)
2 Microbiology (Required Practical) (Biology Only)
3 Osmosis (Required Practical)
4 Food Tests (Required Practical)
5 Enzymes (Required Practical)
6 Photosynthesis (Required Practical)
7 Reaction Times (Required Practical)
8 Plant Responses (Required Practical) (Biology Only)
9 Field Investigations (Required Practical)
10 Decay (Required Practical)
11 Osmosis Models (Extra Practical)
12 Potometers (Extra Practical)
13 Testing a Leaf for Starch (Extra Practical)
14 Effect of Exercise on the Body (Extra Practical)
GCSE Biology Maths skill - 1.2 Surface Area to Volume Ratio
This resource covers a key maths skill for GCSE Biology. The skill covered is Surface Area to Volume Ratio which is needed in Topic 1.2 Transport in Cells.
Included:
Maths skills summary checklist
Information page explaining the maths skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all maths skills here:
https://www.tes.com/teaching-resource/gcse-biology-maths-skills-bundle-13097376
All individual Biology Maths skills for GCSE Biology can be found below:
1.1 Units and Magnification
1.2 Surface area to Volume ratio
2 Cell Cycle Length
3 Rate of Reaction
4 Orders of Magnitude
5 Bacterial Populations
6 Percentage Change
7 Significant Figures and Decimal Places
8 Inverse Square Law
9 Averages
10 Tables
11 Standard Form
12 Ratio, Percentage, Probability, Fraction
13 Punnett Squares
14 Frequency Density
15 Areas of Shapes
16 Population size
17 Equations and Symbols
18 Biomass Transfers
Bundle
GCSE Biology Maths Skills Bundle
This bundle contains 19 worksheets for all key maths skill for GCSE Biology.
Included for each skill is:
Information page explaining the maths skill
Worksheet of questions
Answer sheet
Each resource can be printed as a double sided A4 sheet perfect for in class activity or a homework.
Skills are required for AQA GCSE Biology and Combined Science. Skills are also applicable in other exam boards such as Edexcel and OCR.
All individual Biology Maths skills for GCSE Biology can be found below:
1.1 Units and Magnification
1.2 Surface area to Volume ratio
2 Cell Cycle Length
3 Rate of Reaction
4 Orders of Magnitude
5 Bacterial Populations
6 Percentage Change
7 Significant Figures and Decimal Places
8 Inverse Square Law
9 Averages
10 Tables
11 Standard Form
12 Ratio, Percentage, Probability, Fraction
13 Punnett Squares
14 Frequency Density
15 Areas of Shapes
16 Population size
17 Equations and Symbols
18 Biomass Transfers
GCSE Biology Maths Skill - 4 Orders of Magnitude
This resource covers a key maths skill for GCSE Biology. The skill covered is Orders of Magnitude which can be taught in Topic 4 Organising Animals and Plants.
Included:
Maths skills summary checklist
Information page explaining the maths skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all maths skills here:
https://www.tes.com/teaching-resource/gcse-biology-maths-skills-bundle-13097376
All individual Biology Maths skills for GCSE Biology can be found below:
1.1 Units and Magnification
1.2 Surface area to Volume ratio
2 Cell Cycle Length
3 Rate of Reaction
4 Orders of Magnitude
5 Bacterial Populations
6 Percentage Change
7 Significant Figures and Decimal Places
8 Inverse Square Law
9 Averages
10 Tables
11 Standard Form
12 Ratio, Percentage, Probability, Fraction
13 Punnett Squares
14 Frequency Density
15 Areas of Shapes
16 Population size
17 Equations and Symbols
18 Biomass Transfers
Bundle
GCSE Biology Graph Skills Bundle
This bundle contains 19 worksheets for all key graph skill for GCSE Biology.
Included:
Graph skills summary checklist
Information page explaining the Graph skill
Worksheet of questions
Answer sheet
Each resource can be printed as a double sided A4 sheet perfect for in class activity or a homework.
Skills are required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
All individual Biology Graph skills for GCSE Biology can be found below:
1.1 Variables and Axes
1.2 Intercepts
2 Line of Best Fit
3 Gradients
4 Trends
5 Types of Data
6 Pie Charts
7 Scatter Graphs
8 Line Graphs
9 Bar Charts
10 Ray Diagrams
11 Glucose Graphs
12 Menstrual Graphs
13 Pedigree Charts
14 Histograms
15 Evolutionary Trees
16 y = mx + c
17 Predator-Prey Graph
18 Pyramids of Biomass
GCSE Biology Practical - 3 Osmosis
This resource covers a Required Practical for GCSE Biology of Osmosis which is taught in Topic 1.2 Transport in Cells.
Included:
Biology Practicals summary checklist
Information page explaining the practical
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
A bundle containing all practicals can be found here:
https://www.tes.com/teaching-resource/gcse-biology-practicals-bundle-13143873
All individual Biology Practicals for GCSE Biology can be found below:
1 Microscopy (Required Practical)
2 Microbiology (Required Practical) (Biology Only)
3 Osmosis (Required Practical)
4 Food Tests (Required Practical)
5 Enzymes (Required Practical)
6 Photosynthesis (Required Practical)
7 Reaction Times (Required Practical)
8 Plant Responses (Required Practical) (Biology Only)
9 Field Investigations (Required Practical)
10 Decay (Required Practical)
11 Osmosis Models (Extra Practical)
12 Potometers (Extra Practical)
13 Testing a Leaf for Starch (Extra Practical)
14 Effect of Exercise on the Body (Extra Practical)
GCSE Biology Practical - 5 Enzymes
This resource covers a Required Practical for GCSE Biology of Enzymes which is taught in Topic 3 Organisation and Digestion
Included:
Biology Practicals summary checklist
Information page explaining the practical
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology. Skill is also applicable in other exam boards such as Edexcel and OCR.
A bundle containing all practicals can be found here:
https://www.tes.com/teaching-resource/gcse-biology-practicals-bundle-13143873
All individual Biology Practicals for GCSE Biology can be found below:
1 Microscopy (Required Practical)
2 Microbiology (Required Practical) (Biology Only)
3 Osmosis (Required Practical)
4 Food Tests (Required Practical)
5 Enzymes (Required Practical)
6 Photosynthesis (Required Practical)
7 Reaction Times (Required Practical)
8 Plant Responses (Required Practical) (Biology Only)
9 Field Investigations (Required Practical)
10 Decay (Required Practical)
11 Osmosis Models (Extra Practical)
12 Potometers (Extra Practical)
13 Testing a Leaf for Starch (Extra Practical)
14 Effect of Exercise on the Body (Extra Practical)
GCSE Biology Graph Skill - 5 Types of Data
This resource covers a key graph skill for GCSE Biology. The skill covered is Types of Data which can be taught in Topic 5 Communicable Diseases.
Included:
Graph skills summary checklist
Information page explaining the Graph skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all graph skills here:
https://www.tes.com/teaching-resource/gcse-biology-graph-skills-bundle-13105264
All individual Biology Graph skills for GCSE Biology can be found below:
1.1 Variables and Axes
1.2 Intercepts
2 Line of Best Fit
3 Gradients
4 Trends
5 Types of Data
6 Pie Charts
7 Scatter Graphs
8 Line Graphs
9 Bar Charts
10 Ray Diagrams
11 Glucose Graphs
12 Menstrual Graphs
13 Pedigree Charts
14 Histograms
15 Evolutionary Trees
16 y = mx + c
17 Predator-Prey Graph
18 Pyramids of Biomass
GCSE Biology Maths Skill - 3 Rate of Reaction
This resource covers a key maths skill for GCSE Biology. The skill covered is Rate of Reaction which is needed in Topic 3 Organisation and the Digestive System.
Included:
Maths skills summary checklist
Information page explaining the maths skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all maths skills here:
https://www.tes.com/teaching-resource/gcse-biology-maths-skills-bundle-13097376
All individual Biology Maths skills for GCSE Biology can be found below:
1.1 Units and Magnification
1.2 Surface area to Volume ratio
2 Cell Cycle Length
3 Rate of Reaction
4 Orders of Magnitude
5 Bacterial Populations
6 Percentage Change
7 Significant Figures and Decimal Places
8 Inverse Square Law
9 Averages
10 Tables
11 Standard Form
12 Ratio, Percentage, Probability, Fraction
13 Punnett Squares
14 Frequency Density
15 Areas of Shapes
16 Population size
17 Equations and Symbols
18 Biomass Transfers
GCSE Biology Maths Skill - 5 Bacterial Populations
This resource covers a key maths skill for GCSE Biology. The skill covered is Bacterial Populations which is needed in Topic 5 Communicable diseases.
Included:
Maths skills summary checklist
Information page explaining the maths skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all maths skills here:
https://www.tes.com/teaching-resource/gcse-biology-maths-skills-bundle-13097376
All individual Biology Maths skills for GCSE Biology can be found below:
1.1 Units and Magnification
1.2 Surface area to Volume ratio
2 Cell Cycle Length
3 Rate of Reaction
4 Orders of Magnitude
5 Bacterial Populations
6 Percentage Change
7 Significant Figures and Decimal Places
8 Inverse Square Law
9 Averages
10 Tables
11 Standard Form
12 Ratio, Percentage, Probability, Fraction
13 Punnett Squares
14 Frequency Density
15 Areas of Shapes
16 Population size
17 Equations and Symbols
18 Biomass Transfers
GCSE Biology Maths Skill - 8 Inverse Square Law
This resource covers a key maths skill for GCSE Biology. The skill covered is Inverse Square Law which is needed in topic 8 Photosynthesis.
Included:
Maths skills summary checklist
Information page explaining the maths skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all maths skills here:
https://www.tes.com/teaching-resource/gcse-biology-maths-skills-bundle-13097376
All individual Biology Maths skills for GCSE Biology can be found below:
1.1 Units and Magnification
1.2 Surface area to Volume ratio
2 Cell Cycle Length
3 Rate of Reaction
4 Orders of Magnitude
5 Bacterial Populations
6 Percentage Change
7 Significant Figures and Decimal Places
8 Inverse Square Law
9 Averages
10 Tables
11 Standard Form
12 Ratio, Percentage, Probability, Fraction
13 Punnett Squares
14 Frequency Density
15 Areas of Shapes
16 Population size
17 Equations and Symbols
18 Biomass Transfers
GCSE Biology Maths Skill - 13 Punnett Squares
This resource covers a key maths skill for GCSE Biology. The skill covered is Punnett Squares which is needed in Topic 13 Reproduction.
Included:
Maths skills summary checklist
Information page explaining the maths skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all maths skills here:
https://www.tes.com/teaching-resource/gcse-biology-maths-skills-bundle-13097376
All individual Biology Maths skills for GCSE Biology can be found below:
1.1 Units and Magnification
1.2 Surface area to Volume ratio
2 Cell Cycle Length
3 Rate of Reaction
4 Orders of Magnitude
5 Bacterial Populations
6 Percentage Change
7 Significant Figures and Decimal Places
8 Inverse Square Law
9 Averages
10 Tables
11 Standard Form
12 Ratio, Percentage, Probability, Fraction
13 Punnett Squares
14 Frequency Density
15 Areas of Shapes
16 Population size
17 Equations and Symbols
18 Biomass Transfers
GCSE Biology Practical - 12 Potometers
This resource covers an Extra Practical for GCSE Biology of Potometers which is taught in Topic 4 Organising Animals and Plants
Included:
Biology Practicals summary checklist
Information page explaining the practical
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology. Skill is also applicable in other exam boards such as Edexcel and OCR.
A bundle containing all practicals can be found here:
https://www.tes.com/teaching-resource/gcse-biology-practicals-bundle-13143873
All individual Biology Practicals for GCSE Biology can be found below:
1 Microscopy (Required Practical)
2 Microbiology (Required Practical) (Biology Only)
3 Osmosis (Required Practical)
4 Food Tests (Required Practical)
5 Enzymes (Required Practical)
6 Photosynthesis (Required Practical)
7 Reaction Times (Required Practical)
8 Plant Responses (Required Practical) (Biology Only)
9 Field Investigations (Required Practical)
10 Decay (Required Practical)
11 Osmosis Models (Extra Practical)
12 Potometers (Extra Practical)
13 Testing a Leaf for Starch (Extra Practical)
14 Effect of Exercise on the Body (Extra Practical)
GCSE Biology Maths Skill - 1.1 Units and Magnification
This resource covers a key maths skill for GCSE Biology. The skill covered is Units and Magnification which is needed in Topic 1.1 Cell Structure
Included:
Maths skills summary checklist
Information page explaining the maths skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology and Combined Science. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all maths skills here:
https://www.tes.com/teaching-resource/gcse-biology-maths-skills-bundle-13097376
All individual Biology Maths skills for GCSE Biology can be found below:
1.1 Units and Magnification
1.2 Surface area to Volume ratio
2 Cell Cycle Length
3 Rate of Reaction
4 Orders of Magnitude
5 Bacterial Populations
6 Percentage Change
7 Significant Figures and Decimal Places
8 Inverse Square Law
9 Averages
10 Tables
11 Standard Form
12 Ratio, Percentage, Probability, Fraction
13 Punnett Squares
14 Frequency Density
15 Areas of Shapes
16 Population size
17 Equations and Symbols
18 Biomass Transfers
GCSE Biology Graph Skill - 1.1 Variables and Axes
This resource covers a key graph skill for GCSE Biology. The skill covered is Variables and Axes which can be taught in Topic 1.1 Cell Structure
Included:
Graph skills summary checklist
Information page explaining the Graph skill
Worksheet of questions
Answer sheet
This resource can be printed as a double sided A4 sheet perfect for in class activity or a homework. Recommended for year 9/10 to learn the skill during the topic or for year 11 as recap of skills as exam preparation.
Skill is required for AQA GCSE Biology. Skill is also applicable in other exam boards such as Edexcel and OCR.
There is a bundle containing all graph skills here:
https://www.tes.com/teaching-resource/gcse-biology-graph-skills-bundle-13105264
All individual Biology Graph skills for GCSE Biology can be found below:
1.1 Variables and Axes
1.2 Intercepts
2 Line of Best Fit
3 Gradients
4 Trends
5 Types of Data
6 Pie Charts
7 Scatter Graphs
8 Line Graphs
9 Bar Charts
10 Ray Diagrams
11 Glucose Graphs
12 Menstrual Graphs
13 Pedigree Charts
14 Histograms
15 Evolutionary Trees
16 y = mx + c
17 Predator-Prey Graph
18 Pyramids of Biomass
AQA Biology Checklist - 1.1 Cell Structure
This resource contains a checklist for Topic 1.1 Cell Structure that can be used by students.
Included:
Biology 1.1 Checklist
Combined 1.1 Checklist
This resource aligns with other resources such as:
Graph Skill 1.1 - Variables and Axes
Math Skill 1.1 - Units and Magnification
Required Practical 1 - Microscopy
All individual Checklists for AQA GCSE Biology can be found below:
Paper 1 Bundle
1.1 Cell Structure
1.2 Transport in Cells
2 Cell Division
3 Organisation and The Digestive System
4 Organising Animals and Plants
5 Communicable Diseases
6 Preventing and Treating Diseases
7 Non-Communicable Diseases
8 Photosynthesis
9 Respiration
(Paper 2 Bundle and more checklists coming soon)
Paper 2:
10 The Human Nervous System
11 Hormonal Coordination
12 Homeostasis in Action
13 Reproduction
14 Variation and Evolution
15 Genetics and Evolution
16 Adaptations, Interdependence and Competition
17 Organising an Ecosystem
18 Biodiversity and Ecosystems