Since a secondary source is a source written after an event has occurred, I want to say that the answer is A. Hope this helped!<span />
Answer:
Villus, plural villi, in anatomy any of the small, slender, vascular projections that increase the surface area of a membrane. ... The villi of the small intestine project into the intestinal cavity, greatly increasing the surface area for food absorption and adding digestive secretions.
Replication from formation and separation of the strands
Answer:B
Explanation:
Because aerobic respiration produce alot of energy (looking at kreb's cycle, ETP,)
