Nêu môi trường sống. sinh sản. làm tổ cách dinh dưỡng. Tự vệ tấn công. đặc điểm khác của ong,ấu trùng ve sầu, bướm, châu chấu, bọ ngựa

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.

the real answer is b. scintillation counter

anthropod traits:

a well-developed collarbone

rotating shoulder joints

partially rotating elbow joints

opposable thumb

similar dental formula