excretory system: removes waste from blood.
respiratory system: obtains oxygen so the energy in the nutrients can be extracted.
circulatory system: transports nutrients from small intestine to the othet tissues.
nervous system: regulates and controls digestive functioning.
( Am not completly sure, but i think this is the answer)
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Explanation:
Tunica media; contains connective tissue that provides structural support
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it affects the hardness of the shells because calcium has a high reactivity which causes the shell to be hard
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