Which of these statements is true about heating up air in the lower atmosphere?
a. it occurs mainly through radiant energy.
b. it occurs through convection from earth.
c. it happens to a different extent over land and water.
d. it takes place through conduction between the sun and air.

the correct answer wouuld be that it takes place through conduction between the sun and air

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.