How did the drought affect the size of the bird beaks? O beak depth decreased
O beak depth increased
O beak depth stayed mostly the same

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. calcium carbonate is strengthened by phosphorus.

explanation:

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex