Which best determines the health of a lake used as a source of freshwater?

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

this protocol provides a detailed procedure for nucleoprotein extraction from cultured cells and tissues in an efficient manner.