Paleontologists estimate that ________________.
A)99% of all species that have ever existed are now extinct
B)more than 99% of all species alive today have been discovered and described
C)extinction is tied exclusively to human activities
D)more species are alive today than ever before
E)biodiversity is evenly spread over the earth's biomes

Question

Quizplus · Accepted Answer

Paleontologists have estimated that the vast majority of species that have ever existed on Earth are now extinct, with only a small fraction still alive today. This is supported by the fossil record, which shows many species that used to exist but are now extinct.

Paleontologists Estimate That ________________