Ask Question
10 February, 07:42

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

+1
Answers (1)
  1. 10 February, 08:22
    0
    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.
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “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 ...” in 📙 Biology if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers