Water is an important resource, its use in dams, thermoelectric power and hydroelectric power would be considered .

c. heat from the poles back down towards the equator.

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.