Which plant characteristics are common to pioneer species?

a. Plants with roots that act as wedges to slowly break apart rocks
b. Plants with long, thick roots that tap into deep water supplies.
C. Trees with exposed roots that trap soil
and vegetation
d. Plants with a broad mat of surface roots that quickly soaks up water

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.

so whats the answer

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

the answer is d p: cell, q: organ, r: organ system, s: tissue