In humans, are used to move a cell within its environment while are used to move the environment relative to the cell

the answer is g1

coal is not sustainable because it will one day run out.

not sure but try c two haploid cells

explanation:

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.