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Answers
1.because some are from nature and some are from chenicals.
2.primary consumers.
3.The functions of the ecosystem are as follows: It regulates the essential ecological processes, supports life systems and renders the stability. It is also responsible for the cycling of nutrients between biotic and abiotic components. It maintains a balance among the various trophic levels in the ecosystem.
4.the cyclic process of life and death would be disrupted and life would come to an end.
5.The ozone layer prevents from danger sun rays which causes skin cancer.
6.The 10% Rule means that when energy is passed in an ecosystem from one trophic level to the next, only ten percent of the energy will be passed on. A trophic level is the position of an organism in a food chain or energy pyramid.