This layer of the Earth varies in thickness, between 5 km and 35 km. It is broken into large tectonic plates that move as a result of convection currents in the asthenosphere.

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).

c. the initial amount of money placed in the savings account