What refers to two different alleles in a cross

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:

protist eukaryotes that are not plants, animals, or fungi ("misfits")

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

the areas around the equator