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Why do the oldest stars we observe contain almost nothing but hydrogen and helium?
Thyroid Hormone
Hormones produced by the thyroid gland, including thyroxine (T4) and triiodothyronine (T3), that regulate the body's metabolism.
Specific Tissues
Distinct types of material of which animals or plants are made, consisting of specialized cells and their products.
Secretion
The process by which substances are produced and discharged from a cell, gland, or organ for a particular function in the organism or for excretion.
Epinephrine
A hormone and neurotransmitter also known as adrenaline; involved in regulating heart rate, blood vessel and air passage diameters.
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