The circulatory system supports the skeletal muscular system by:

a) sending nerve signals to the muscles.

b) breaking down glucose to release energy.

c) transporting glucose to the cells where it is broken down and energy is released.

d) the circulatory system does not directly support the skeletal muscular system.

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explanation:

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clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.