You’re talking about the endoplasmatic reticulum :)
Answer:
1
Explanation:
In symbioses, parasitism is where an organism (small) benefits from
another organism by residing on it and causing harm to it.
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➷ It makes the circulatory system more efficient and helps to keep a constant body temperature. It allows an efficient supply of oxygenated blood to the body cells.
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➶ Hope This Helps You!
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The easiest way to explain it is.. it keeps it from exploding lol