Natural ecosystems and human activity

This powerpoint answers the following questions
Explain which physical factors affect and are affected by the living things in an ecosystem
Explain some of the relationships between living things within an ecosystem
Explain how energy flows along food chains and webs within an ecosystem
Use pyramids of numbers and pyramids of energy to describe food chains
Describe photosynthesis and respiration as key processes in plants
Explain how nutrients cycle within an ecosystem in general, and for carbon in particular
Describe how habitats are lost and the consequences of their loss
Explain why forests are removed and the consequences of their removal
Explain why we need strategies for the sustainable management of forests
Estimate biodiversity using a variety of methods together with random and systematic sampling
Explain the advantages and disadvantages of various strategies for conserving ecosystems and the species within them