When did oxygen levels start to decline from 35 percent down to today's levels?

A. Before the Silurian period

B. After the Triassic period

C. During the Permian eriod

D. After the Carboniferous period

Question

Biology

Camilla Harvey

22 September, 08:05

When did oxygen levels start to decline from 35 percent down to today's levels?

A. Before the Silurian period

B. After the Triassic period

C. During the Permian eriod

D. After the Carboniferous period

+3

Answers (1)

Know the Answer?

Skyla Kirby · Answer 1

The oxygen levels on Earth were about 30-35% higher during the Carboniferous. That contributed to the enormous insects that evolved during that geological period. So if the oxygen level was at its peak during the Carboniferous, it only went in one direction after-> down. So the answer could only be D. After the Carboniferous period.

When did oxygen levels start to decline from 35 percent down to today's levels?A. Before the Silurian periodB. After the Triassic periodC. During the Permian eriodD. After the Carboniferous period

When did oxygen levels start to decline from 35 percent down to today's levels?

A. Before the Silurian period

B. After the Triassic period

C. During the Permian eriod

D. After the Carboniferous period