5. Radio waves that can be converted into sound.
a. can be heard, and they carry energy
b. cannot be heard, but they do carry energy
can be heard, but they do not carry energy
cannot be heard, and they do not carry energy

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).

and after water is usually warmed by the sun the water temperature raises and then evaporates .