Which motion is mainly responsible for the difference in the constellations visible at midnight on these two dates?
A) The Sun orbits Earth.
B) Earth orbits the Sun.
C) The stars in the constellations orbit Earth.
D) Earth orbits the stars in the constellations.

answer; i believe that the correct answer is (lung);

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).