Most cells in your body do not respond to most hormones. For example, a hormone known as erythropoietin causes the bone marrow to make more red blood cells, but has little effect elsewhere in the body. Explain how the plasma membrane could control this effect.

italy's population growth rate is almost at zero, the national statistics agency, istat, said on monday, mainly due to a dwindling birth rate.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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