Answer:
D. pituitary gland
~+. lil more info .+~
The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic). The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells.
<span>Thousands of years of isolation between tribal groups</span>
A predator, prey, carnivore
LOng term primary productivity terrestrial ecosystem increases carbondioxide in atmospheric and nitrogen desposition gases associated primarily with fossil fuel burning increasing plant growth ov re a long period of time. terrestrial primary production varies considerably across the surface of earth and among different ecosystem types.
The <span>cornea and the optic nerve.</span>