SAT Subject Biology Practice Question 217: Answer and Explanation

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Question: 217

7. In what order did the following types of organisms appear in the history of life on Earth?

I. Eukaryotes

II. Heterotrophic organisms

III. Metazoa

IV. Photosynthetic organisms

A. II, I, IV, III
B. II, I, III, IV
C. II, IV, I, III
D. IV, I, II, III
E. IV, II, I, III

Correct Answer: C

Explanation:

The first organisms were heterotrophic prokaryotes. The evolution of photosynthetic prokaryotes (cyanobacteria) led to an increase in Earth's atmospheric oxygen level. Eukaryotes and metazoa (animals) then evolved.

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