Biology

1In a predator–prey cycle, predator numbers usually peak

2In a food chain, green plants are the

3A community of organisms interacting with their non-living environment is

4A relationship in which both organisms benefit is

5A food web is

6Eutrophication of a lake is caused mainly by

7Only about 10% of energy passes to the next trophic level. If producers fix 10,000 kJ, energy reaching secondary consumers is about

8An organism that lives on or in another and harms it is a

9Organisms that break down dead matter and return nutrients to the soil are

10In the food chain grass → grasshopper → lizard → hawk, the secondary consumer is the