Which of these sentences is true about genetic variation? mutations always carry out beneficial genetic variations in an organism. mutations always carry out harmful genetic variations in an organism. mutations are one of the key factors in genetic variation. done

i won't lie i don't know so go online and ask google thats what i do

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.