An atp molecule is made up of which of the following?

a)phosphate groups, ribose sugar, adenine base
b)phosphate groups, deoxyribose sugar, thymine base
c)carboxylic group, ribose sugar, adenine base

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

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).

condenser is used to focus in the light microscope.