Which event occurred first?
A) evolution of vascular plants
B) evolution of modern humans
C) oxygen accumulation in the Earth's atmosphere
D) evolution of prokaryotes
E) evolution of reptiles

Question

Quizplus · Accepted Answer

The evolution of prokaryotes is widely recognized as the earliest of the events listed, occurring around 3.5 to 3.8 billion years ago. This predates the other events such as the accumulation of oxygen in the atmosphere, the evolution of vascular plants, reptiles, and modern humans.

Which Event Occurred First