As a general rule, the lower the npp of an ecosystem, the larger the ranges of its top predators must be. for example, sharks in the open ocean must cover huge distances. explain why this is the case.

Net primary productivity (NPP) can be defined as the amount of energy made available by plants to animals, only at the herbivore leve.  The NPP of an ecosystem depends on different factors such as the levels of heat, moisture, nutrients available, competition..If the NPP is low (little available food) than animals sparse (have to move to find it).

weathering is the answer.

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.