How would a houseplant respond to sunlight that comes from one direction?
a. by closing its leaves at night
b. by curling its stem around its leaves
c. by bending its stem toward the sun
d. by growing roots downward through the soil

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.

straight or amphibians are homeothermic to thermal