TOEFL Reading: ETS-TOEFL阅读机经 - VO1350ES79J37W74L$

Paragraph 1 supports which of the following inferences? A. After complex life forms arose on Earth, bacteria quickly evolved in order to maintain favorable conditions for life. B. Early life forms on Earth arose from the process of photosynthesis. C. The development of complex life on Earth depended on the presence of bacteria that could be consumed by larger organisms. D. Complex life forms on Earth may not have evolved if Earth had been farther from or closer to the Sun.