Why are bacteria a necessary part of the nitrogen cycle? . . a. living things cannot use atmospheric nitrogen.. . b. living things cannot use the nitrogen in plants.. . c. bacteria are the main nitrogen reservoir.. . d. bacteria are the main nitrogen transpirators..

Food provides molecules that serve as fuel and building material for all organisms. plants undergo photosynthesis and make their own food. other organisms, like us and the horse seen above, are consumers and eat food. how do all organisms use food as fuel? be sure to include the name of the process in your answer. me.

Ausable water source is one that can be used by humans for drinking or agriculture. identify the water reservoirs as usable or unusable based on their current state. oceans rivers glaciers freshwater lakes groundwater

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above