What is the only force acting upon an object in free fall

Although there are a limited number of amino acids many different types of proteins exist because..

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

In guinea pigs, black fur (b) is dominant over white fur (b). cross a heterozygous (hybrid) black guinea pig with a homozygous (purebred) white guinea pig. complete a punnett square, identify the genotype(s), phenotype(s), and probability (% and fraction) that the offspring will be black and white?