Through the process of transpiration, plants
a.
absorb sunlight to produce energy.
b.
break down sugar for energy.
c.
transfer pollen grains to their stigma.
d.
lose water through their leaves.

Through the process of transpiration, plants

A.  absorb sunlight to produce energy.

B.  break down sugar for energy.

C.  transfer pollen grains to their stigma.

D.  lose water through their leaves.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.