A message to drink is sent when Select one: a. too little ADH is detected by the kidneys. b. the kidneys detect too much glycogen. c. ADH is detected by the hypothalamus. d. angiotensin is detected by the hypothalamus.

d. angiotensin is detected by the hypothalamus.

Explanation:

Angiotensin is a hormone which causes the narrowing of the blood vessels. This helps in maintaining the blood pressure and also maintains the fluid balance in the body. The hormone acts on the brain. This hormone binds to the hypothalamus gland of the body, it stimulates the thirst and increases the demand for water intake. It also stimulates the release of antidiuretic hormone by the pituitary gland to increase the concentration of urine by preventing water loss.

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answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."