Basics of Biology
Biology and Life
What is the heterotroph hypothesis?
The heterotroph hypothesis suggests that the first primitive life forms on early Earth— evolving about 3.5 billion years ago—could not manufacture their own food (thus, they were heterotrophic). Because of the lack of oxygen in the early atmosphere, they were anaerobic (did not need oxygen to survive) and probably absorbed the primordial soup’s organic molecules as nutrients.