1. Explain how fossils are formed and give three examples.
2. Compare relative and radioactive dating.
3. Describe how Miller and Urey tested Oparin's hypothesis and the results of the
experiment.
4. Explain the endosymbiotic theory proposed by Lynn Margulis and two pieces of
evidence for the theory.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

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