A scientist is observing a eukarotic cell and a prokaryotic cell. Which structure could she only observe in the eukaryotic cell?
cytoplasm
DNA
ribosomes
a nucleus
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A Nucleus.

Explanation:

This is because animals have mitochondria and require a lot of energy

it is d nucleus

Explanation:

i got it right on edg

(im sure its right but i its wrong im sorry)

b. heterotroph

explanation:

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.