Extended Response

Little direct evidence has been found of any life that existed in the first few billion years of Earth's history.

Part A Describe the major steps that may have led to the development of eukaryotic organisms.

Part B Describe evidence that supports hypotheses about some of these steps.

For short-response and essay questions, be sure to answer the prompt as fully as possible. Include major steps, important facts, descriptive examples, and supporting details in your response.

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