Answer:
A. It secretes chemical messengers that travel through the blood to signal changes at target cells.
Explanation:
The endocrine system is made up of glands that generate and release hormones; chemical matters produced in the body that control the activity of cells or organs.
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The person is most likely having a heart attack
There are a total of nine essential amino acids. These are: Valine, Isoleucine, Leucine, Threonine, Histidine, Lysine, Phenylalanine, and Tryptophan.
Answer:
I think the school meals to assure that they (blank)
