It is Chromosomal Inversion.
An inversion<span> is a </span>chromosome<span> rearrangement in which a segment of a </span>chromosome<span> is reversed end to end. An </span>inversion<span> occurs when a single-</span>chromosome<span> undergoes breakage and rearrangement within itself. </span>
Easy. Answer is oxygen because it says which one was missing before any life was on earth. And in order to have life on earth you need oxygen!
:)
Answer:
False
Explanation:
it can be used to date stuff up to about 50000 years, so i'd say that its halfly false, so false is correct :)
