I really need help and don't understand this. You don't have to do whole thing I just really want to know how to do it, so it would be very helpful if you can get me started :)

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

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smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

the answer is b. dilution