Suppose Around 50 million years ago, in contrast, oxygen levels in the atmosphere measured 23 percent--2 percent higher than today.
Can we infer that "A million years ago, oxygen was higher"? Yes, no, or maybe?
Suppose Around 50 million years ago, in contrast, oxygen levels in the atmosphere measured 23 percent--2 percent higher than today. Can we infer that "A million years ago, oxygen was higher"? Yes, no, or maybe?