Which cell process requires energy expenditure?
a) osmosis
b) phagocytosis
c) passive transport
d) facilitated diffusion

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

true is the answer : )

because the light is a great source of energy for the plants to survive. (i hope this )