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Even if philosophers accept and study the importance of change,a full theory of evolution by natural selection cannot exist without
Adrenal Gland
A pair of endocrine glands that sit just above the kidneys and produce hormones such as adrenaline and cortisol, which help control heart rate, blood pressure, and other bodily functions.
Hormones
Chemical messengers produced by glands in the body that regulate physiological functions and behavior by traveling through the bloodstream to target organs.
Bloodstream
The network of blood vessels through which blood circulates in the body.
Secreted
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.
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