|
|
| 6. |
According
to the heterotroph hypothesis, |
| (A) |
anaerobic and aerobic organisms evolved simultaneously |
| (B) |
photosynthetic autotrophs evolved first, since they required
only energy from the sun and simple molecules from the environment |
| (C) |
autotrophs evolved before a carbon source was made available |
| (D) |
anaerobic heterotrophs evolved first |
| (E) |
chemosynthesis was critical to the evolution of heterotrophic
organisms |