Fossil evidence indicates that complex life forms, capable of generating easily fossilized hard parts like shells or bones, have existed in abundance on Earth since approximately ___ years ago.
A) 5,440
B) 544 thousand
C) 544 million
D) 5,440,000,000
E) 544,000,000,000

Question

Quizplus · Accepted Answer

The question is referring to the Cambrian Explosion, which occurred about 544 million years ago and marks the emergence of a wide variety of complex life forms with hard parts that can be easily fossilized. Therefore, the correct answer is C) 544 million.

Fossil Evidence Indicates That Complex Life Forms, Capable of Generating