Three layers of strata are deposited. the law of superposition explains the age of the layers by stating that the layer is on the top and the layer is on the bottom.

youngest, oldest

Explanation:

Three layers of strata are deposited. The law of superposition explains the age of the layers by stating that the youngest layer is on the top and the oldest layer is on the bottom.

The law of superposition is a basic law in geology which was first proposed by the Danish scientist Nicolas Steno in the late 17th century. The law of superposition explains the age of the layers of strata by stating that in a stratigraphic sequence that is left undisturbed, the youngest layer will be at the top, and the oldest layer will be at the bottom of the sequence. It means that each layer of strata is younger that the one under it, and older than the layer above it.

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:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.