Photosynthesis first occurs on Earth by about ___ years ago.
A) 4.6 billion
B) 3.5 billion
C) 2.7 billion
D) 1.1 billion
E) 0.5 billion

Question

Quizplus · Accepted Answer

The earliest evidence of photosynthesis on Earth is found in rock formations that are about 3.5 billion years old. These formations contain multiple layers of fossilized cells that resemble modern-day cyanobacteria, which are believed to have been the first organisms capable of photosynthesis.

Photosynthesis First Occurs on Earth by About ___ Years Ago