What is it hypothesized that the earliest known cells used for producing energy?
A) iron oxide
B) oxygen gas
C) carbon dioxide
D) water vapor
E) iron sulfide

Question

Quizplus · Accepted Answer

It is hypothesized that the earliest known cells used iron sulfide for producing energy through a process called chemosynthesis. This process involves oxidizing hydrogen sulfide or other compounds to generate ATP for cellular processes. Iron sulfide would have been abundant in the sulfate-rich environments of early Earth.

What Is It Hypothesized That the Earliest Known Cells Used