The modern theory of evolution states that a basis for variation within a species is provided by mutations. It plays an important role in evolution. The best source of all genetic variation is mutation. It is important as the first step of evolution<span> because it creates a new DNA sequence for a particular gene, creating a new allele.</span>
Three structures make up the brainstem: The medulla, which controls breathing, swallowing, blood pressure, and heart rate. The pons (Latin for "bridge"), which links the cerebellum to the cerebrum. The midbrain, which governs rudimentary vision and hearing.
I believe it would be c not exactly sure tho