93AU from the surface of the sun, or the third planet out from the surface of the sun.
Milgram found that subjects were more likely to obey in some circumstances than others. Obedience was highest when: Commands were given by an authority figure rather than another volunteer. The experiments were done at a prestigious institution.

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The answer to this will be is : </h3><h2 /><h2>
C. Plant roots grow into a crack in a rock.</h2><h2 /><h2>

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Because "mechanical weathering" It's a example of the Plants roots that grow on into a crack in the rock.
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Answer:
Explanation:
The barnacles are only able to attach themselves to surfaces in the water. Since the surface is limited, barnacles are attaching themselves to the other barnacles, crowding the rock. The muscles were not able to grow or attach themselves off the surface of the rock. Same thing with the mussels that are growing on the rock. So not only barnacles are crowding the rock, but Mussels as well are crowding the rock.