How do you do a CER again? I completely forgot.

There are three steps Claim, evidence, and reasoning

Explanation:

CER is :  claim being made, lists the evidence, and then provides reasoning that illustrates why that evidence is correct for that particular claim, hopefully referencing aspects of the cell membrane.

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.

true                                                                                                       true true true true true true