It has been proposed that the first living organisms were:
A) heterotrophs.
B) autotrophs.
C) chemosynthetic.
D) photosynthetic.
E) multicellular.

Question

Quizplus · Accepted Answer

Most scientists believe that the first living organisms on Earth were heterotrophs, which are organisms that obtain their food by consuming other organisms. These organisms likely appeared around 3.5 to 4 billion years ago, before photosynthesis had developed as a means of producing food. Heterotrophic organisms could have obtained nutrients from simple organic compounds in the environment, such as methane and ammonia, or from the thermal vents in the deep ocean where there are high concentrations of chemical nutrients.

It Has Been Proposed That the First Living Organisms Were