What is an earth revolution, what shape is it’s path, and how long it last

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity