The photograph shows a species of tree frog. [Figure 4.1: A species of tree frog.] Each tree frog of this species is either grey or green in colour. The following are true for both grey and green tree frogs. They: • eat insects • live above the ground in vegetation • live near water and lay their eggs in small pools • are sometimes eaten by snakes and birds. Grey tree frogs are more commonly found in areas where there are many trees with grey bark. Green tree frogs are more commonly found in areas where there are many swamp and marsh plants with green leaves.

1. (a)State the type of variation shown by the colour of these tree frogs.[1]
2. (b)(i)Tree frogs eat insects which are herbivores. State the meaning of the term herbivore.[1]
3. (b)(ii)State the trophic level of the tree frogs.[1]
4. (c)Use your knowledge of the process of natural selection to explain the distribution of grey and green tree frogs in different areas.[5]

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