3:they are usually microscopic
Answer:
I believe it is the plasma in our bloodstream
Explanation:
plasma holds most of the nutrients in our body and flows in our blood transporting them through our body.
By definition, a sympatric speciation is a biological process wherein the evolution of a certain species most likely comes from their single ancestral species. Its main difference from the allopatric speciation is that the evolution does not necessary require to be physical in nature, therefore, it is most likely to occur less frequent.
Not as many people die at a young age therefore increasing the population and birth rate because more people are able to have children.