differences in inheritable characteristics that are present in a population.

is a particular type of organism or population of organisms which share some characteristics and can interbred to produce a fertile offspring.

is made up of interacting populations and the abiotic factors that support them.

occurs when fertilizers, animal wastes, sewage, or other substances rich in nitrogen and phosphorus flow into waterways, causing extensive algae growth.

sulfur and nitrogen compounds react with water and other substances in the air to form sulfuric acid and nitric acid.

is the increasing concentration of toxic substances in organisms as trophic levels increase in a food chain or food web.

is an ethic of use, allocation and protection of valued resources.

implies the use, allocation and protection of the variety of flora and fauna resources in a manner that ensures the sustainability of these resources.

is a proposed or adopted course of action that guide decision to obtain rational outcomes.

proclamation of laws by a recognized institution.