The cells in the heart need a constant supply of nutrients / oxygen and to get rid of their waste products ans that why it needs its own special circulatory system.
Answer:
al chile no se hablar inglés y no le entendi
The best answer to the question that is being presented above would be letter <span> D. the sight of the hawk circling. It is the unconditioned stimulus for the vervent monkey's behavior because it was the normal response and was not paired with anything that would condition behavior.</span>
Answer: the atrioventricular heart valve open and closed imcubent on different blood pressure on both sides.
