How did the first life on Earth obtain energy?
A) photosynthesis in the presence of oxygen
B) photosynthesis in the absence of oxygen
C) heterotrophic consumption of organic molecules
D) autotrophic consumption of organic molecules
E) phototrophic consumption of inorganic molecules

Question

How did the first life on Earth obtain energy?
A) photosynthesis in the presence of oxygen
B) photosynthesis in the absence of oxygen
C) heterotrophic consumption of organic molecules
D) autotrophic consumption of organic molecules
E) phototrophic consumption of inorganic molecules

Quizplus · Accepted Answer

The evidence does not point to the first organisms being photosynthetic, so they would have had to have been heterotrophs.

How Did the First Life on Earth Obtain Energy