3. What are structures C and D in Figure 13–1, and what is their significance?

check for the pregnancy rating of drug. if its class c or d see if other alternatives

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.

it depends on how much it could carry.