1-What is a trophic level? Give an example of a food chain and draw the different trophic levels in it.
2-What is the role of decomposers in the ecosystem?
3-Suggest two ways in which biodegradable materials affect the environment?
4-Suggest two ways in which nonbiodegradable substances affect the environment?
5-What is ozone and how does it affect an ecosystem?
6-What can you do to reduce your garbage disposal problems? Describe any two ways.
7-Is leather a biodegradable material?
8-Is plastic a biodegradable material?
9-Is wood a biodegradable material?
10-Do grass, goat, human form a food chain?