D.
A fixed allele is homozygous within a population so D should be the correct answer.
Hope this helps!
A substance that tends to reduce the surface tension of a liquid in which it is dissolved (took that right from dictionary.com)
<span>Members of the archaea are complex single-cells organisms that are often thought to be bacteria; however, they are actually prokaryotic microbes that lack a cell nucleus and membrane. They often thrive in extreme conditions such as extreme heat.</span>
Answer:
pressure
Explanation:
the earth's tectonic plates create pressure to make the magma rise
