A principle that states in a sequence of undisturbed rocks, the oldest rocks are on the bottom and the rocks become progressively younger toward the top

Choose from these
(Superposition)
(Uniformity)
(Fault)
(Overfolding)

super position

Explanation:

because because it is arranged in a sequence

Fluctuations in the phosphorus cycle in aquatic ecosystems

a. can lead to changes in the growth rates of aquatic populations

Explanation:

The rise in phosphorus quantity within the aquatic scheme can increase the quantity of protoctist among that scheme. Once the quantity of protoctist is raised, the aquatic organisms can have loads of food supply which is able to increase the expansion rate among their population.