Where does cell respiration happen in the cell

In mitochandia and cytoplasm

Explanation:

mitochandira is the eukaryotic cell structure where cellular respiration occure.

cytoplasm is jelly like matterial found between plasma membrane and nuclear envelople it has organelles for performing respiration.

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.