Each lymphocyte has thousands of receptor proteins in its membranes. what is the job of these receptor proteins?

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

Most crimes involve some evidence relating to the human body; for that reason, what related science is frequently used in forensic investigations? a)psychiatry b)physics c)botany d)biology

What causes eclipses? check all that apply. earth's rotation on its axis moon's shadow covering the sun earth's shadow covering the moon earth's orbit and moon's orbit occasionally aligning the moon and sun's gravity pulling in the same direction