This would have to do with aerobic and anerobic respiration
Answer:
The endocrine system is a chemical messaging network. Endocrine glands secrete hormones, which are carried by the circulatory system throughout the body. The primary endocrine glands are the pituitary, hypothalamus, pineal gland, thyroid, parathyroid, adrenal, pancreas, ovary, and testis. Hormones maintain homeostasis in the body.
Explanation:
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Anticline I believe would be the answer but in not the smartest so yeah
These structures are called Vestigial structures, they resemble structures from the organism's ancestors, but don't have a real purpose for them now.
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