The answer is C.) Sac. More formally known as the amniotic sac. It's also sometimes called the bag of waters.
Answer: Gene flow is the movement of alleles from one population to another as a result of the migration of individuals. This causes a reduction in the differences between populations. ... Genetic drift is a change in allele frequencies due to change of events in a small breeding population.
Stomach contracting to mix foods with enzymes
By determining the density of the object
B. The peri-renal fat is good at protecting the kidney and keeping it in place