How would you determine the credibility and validity of this scientific claim?​

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

Number and variety of living organisms includes genetic, species, and ecological types

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water