Sciences use the science called blank to classify organisms based on how they are blank

Taxonomy (which literally means “arrangement law”) is the science of classifying organisms to construct internationally shared classification systems with each organism placed into more and more inclusive groupings

Explanation:

Hope it Helps :P

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

compost can be added to topsoil as a:

pesticide