The first organisms on Earth were most likely A) autotrophs that obtained energy through the C₄ photosynthetic pathway. B) autotrophs that obtained energy through the CAM photosynthetic pathway. C) heterotrophs that obtained energy from amino acids and sugars forming spontaneously in the early atmosphere. D) heterotrophs that obtained energy from CO₂ and high-energy nitrogen compounds.

Question

Quizplus · Accepted Answer

The first organisms were likely heterotrophs that consumed organic molecules available in their environment, which formed spontaneously in the early Earth's atmosphere.

The First Organisms on Earth Were Most Likely