The immune system is made up of:

options:

organs

tissues

cells

all of the above (since cells and tissues make up organs)

the answer is d p: cell, q: organ, r: organ system, s: tissue

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.

gag reflex, poor dentition, gum retraction

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