4. In what cellular function does the structure shown here play a role? O A. They play a major role in protein synthesis.
O B. They act as the powerhouse for the cell.
O C. They are involved in the separation of chromosomes during cell division
O D. They are involved in photosynthesis.

letter A. they play major role in protein synthesis

Explanation:

 They act as the powerhouse for the cell. They are involved in the separation of chromosomes during cell division.

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 median of the data is 4.5.