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B3 Life on Earth Add notes and diagrams to make it useful

Explain what the word “variation” means and how it is caused. Give examples in your answer. Explain what a mutation is, how it can happen and what it causes. H ow are sustainability and biodiversity linked?. Give three ways carbon can be released into the atmosphere.

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B3 Life on Earth Add notes and diagrams to make it useful

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  1. Explain what the word “variation” means and how it is caused. Give examples in your answer Explain what a mutation is, how it can happen and what it causes. How are sustainability and biodiversity linked? Give three ways carbon can be released into the atmosphere Give two ways carbon can be removed from the atmosphere What is nitrogen used for in plants and animals? Explain how humans can cause the extinction of species Directly Indirectly Name two types of evidence we can use to support the theory of evolution. Describe one loop of the nitrogen cycle using these words: Nitrogen-fixing, nitrates, soil, atmosphere, nitrogen, denitrifying, bacteria. What is meant by “classification”? B3 Life on Earth Add notes and diagrams to make it useful Explain energy loss in food chains and how this limits the length of a food chain. How can nitrogen get into the soil Naturally Via humans List the FIVE factors that could lead to extinction (PACED) What are the similarities and differences between natural selection and selective breeding? Draw a diagram to show how all hominids had a common ancestor. What are the four stages in natural selection? Explain each one. Ultimately, where does all our energy come from? Give an example of an adaptation and how it has helped that plant or animal to survive. What three things were problems with Darwin’s theory of natural selection? How have they been overcome now? What are the similarities and differences between Lemarck and Darwin’s theories of evolution? What is a hominid? Give 2 ways in which big brains helped early humans to survive.

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