I believe it is A. Primary succession starts with plants and rocks.
Answer:
The volume of pollutants decrease in the ecosystem
Should be called the Manubrium!
"Natural selection<span> is the differential survival and reproduction of individuals due to differences in </span>phenotype<span>. It is a key mechanism of </span>evolution<span>, it is a change of </span>heritable traits<span> in a </span>population<span> over time"</span>