Answer:
Blood absorbs and distributes heat throughout the body. It helps to maintain homeostasis through the release or conservation of warmth. Blood vessels expand and contract when they react to outside organisms, such as bacteria, and to internal hormone and chemical changes.
How large extinct animals were, at the time.
Diffusion/passive transport. Requires protein channels to allow passage through the membrane
Answer:
Rivers flow downhill, pulled by gravity toward the sea.
