CB5f lesson for the new Edexcel science GCSE (9-1) looking at physical and chemical barriers.
The lesson includes how pathogens get into the body, what physical and chemical barriers are, examples of barriers to pathogens, what STI's are, How STI's are spread and how to reduce the spread of STI's.
The lesson includes how pathogens get into the body, what physical and chemical barriers are, examples of barriers to pathogens, what STI's are, How STI's are spread and how to reduce the spread of STI's.
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£2.00