What role does phosphorylation and dephosphorylation play in cell signaling? what role do secondary messengers, such as ca+2 and cyclic amp (camp), play in cell signaling? why are they called secondary messengers? what does cell signaling have to do with homeostasis of cells? how else, besides cell signaling, do cells do to maintain homeostasis? organisms respond to changes in their environment through behavior and physiological feedback mechanisms. give two specific examples of behavior mechanisms and the physiological response(s) of the organism(s).

Urgent. the table shows the relative blood flow through some organs in the human body that is, the percentage of blood that flows through a given organ, through which organ(s) does all the blood flow? explain the effect of exercise on blood flow to skeletal muscles.

Aquaternary consumer species would be expected to have a smaller population than a secondary consumer species. select the best answer from the choices provided t f

Recently, crops of vegetables such as lettuce and green onions have been contaminated, while they are still on the farm, with bacteria that cause food poisoning. how will science influence the way the government responds to prevent an increase in food-borne diseases? because science has shown that lettuce and green onions are not nutritionally valuable, the government may pass laws that ban the sale of lettuce and green onions. because science has shown that there is no way to prevent bacterial contamination, the government may pass laws that punish businesses that buy lettuce and green onions. because science has shown that the washing of hands prevent the spread of infectious diseases among people, the government may pass laws that require hand washing by everyone who handles food. because science has shown there are ways to find the source of the contamination, the government may pass laws that require farm practices that reduce the contamination of lettuce and green onions.