The answer to this question would be A:growth factors
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ACTH's principal function is to stimulate the cortex (outer layer) of the adrenal glands (located near the kidneys) to secrete a group of steroid hormones called glucocorticoids. Glucocorticoid hormones control the body's use of sugar and also help regulate biological functions during stressful moments
They lower the average density of their body; because of the air it feels like a slight decrease in the weight.