Question

During biological evolution, the first living organisms were _______

• A. Autotrophs
• B. Heterotrophs
• C. Eukaryotes
• D. Prokaryotic plants

Answer 1

Answer:

B. Heterotrophs

• Heterotrophs were first living organisms to evolve, as they originated among organic molecules and oxygen-free atmosphere.

• They were anaerobes capable of respiration in the absence of oxygen.

• They only depended on the existing molecule for their nutrition.