The Cambrian explosion refers to ____.
A) a meteorite impact
B) a sudden appearance of fossils
C) a sudden extinction
D) the start of evolution
E) volcanism that created the Ring of Fire

Question

Quizplus · Accepted Answer

The Cambrian explosion refers to a sudden appearance of fossils in the fossil record during the Cambrian period, about 541 million years ago, which marks the beginning of complex, multicellular life. It is characterized by the sudden and rapid appearance of a diverse array of animal phyla, which had not been present in the preceding Precambrian period.

The Cambrian Explosion Refers to ____