What is the function of the mitochondria?
a.
to secure the nucleus at the center of a cell
b.
to provide energy for the cell
c.
to provide immune defense for the cell
d.
to move materials in and out of the cell

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.

not sure if this is what you'r looking for eubacteria and archaebacteria