_______ represent(s) the largest source of unregulated hazardous waste

             form the base of the food chain in the ocean

Downwelling  ________.

The most problematic greenhouse gas produced from most landfills is          

Aeration tanks are used in wastewater treatment plants to reduce _____ because of the high              .

Macronutrients _____.

For compound C,  17 mg/kg probably represents         .

The most important organ in clearing toxicants from the body is the _____which makes them           so they can be removed from the body.

A chronic exposure is:

The majority of Earth’s fresh water exists______ .