The United States government agency that helps maintain healthy ecosystems is the . A)
Alliance to Save Energy
B)
American Council for an Energy Efficient Economy
C)
Federal Environmental Protection Agency
D)
National Institute of Environmental Health Science
E)
US Fish and Wildlife Service

I think the answer is D (National Institute of Environmental Health Science)... if not E

Explanation:

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

d) center of the mid-ocean ridge

give brainleysest

sinserly,

steckh986