According to the theory of island biogeography, which of the following is not an island ecosystem?

a.
a mountain with thriving vegetation surrounded by an arid desert.
b.
the open ocean.
c.
grasslands that surround a lake.
d.
a cave within the forests of the appalachian mountains in the eastern united states.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

b a mature ovary of a plant.