2 answers:
A substance is usually a form of matter having constant chemical composition and characteristic properties.
Answer:
the real physical matter of which a person or thing consists and which has a tangible, solid presence.
Explanation:
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the answer is b. muscular walls of the arteries
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a muscle response
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twitch, relaxation
Mass..... mass measures the amount of matter in a substance or object
THE ANSWER IS C.) MITOTIC DIVISON
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