Atheory of evolution that states that a species evolves in spurts of rapid change and then goes through periods of no change is known as adaptive radiation convergent evolution divergent evolution punctuated equilibrium

Punctuated equilibrium

Explanation:

Adaptive radiation: It is a rapid evolution of many species from common ancestor. It generally occurs when an individual organism enters in new area or environment.

Convergent equilibrium : when species have different ancestors but have developed or acquired similar features.

Divergent equilibrium: when two different species evolved from same or common ancestors.

Punctuated equilibrium: when organisms are in major change causes evolutionary pressure, result in rapid burst until stasis reached again.

So the answer is Punctuated equilibrium.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.