Example #3 : In horses, brown horses are codominant to white horses. The heterozygous phenotype is an appaloosa horse (a white horse with brown spots). Cross a white horse with an appaloosa horse .

the core of the sun is so hot and there is so much pressure, nuclear fusion takes place, hydrogen is changed to helium. nuclear fusion creates heat and photons. when the heat reaches the earth it warms the molecules of the atmosphere, and they warm other molecules and so on.

i think its the first one

the animal that would be cutest if scaled down to the size of a cat? elephant

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).