B. because a mass extinction is caused by several causes to force a group of organisms to die.
The activity of the cell that is not powered by the energy produced through cellular respiration is passive transport.
The cell is the smallest unit of an organism. A cell is self sufficient. Cells obtain energy for their activities via cellular respiration. This is the breakdown of glucose to produce energy.
Passive transport is the movement of solute across the cell membrane without requiring energy for the process. Therefore, it does not require energy produced during cellular respiration.
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Answer:
Plants can use ammonia as a nitrogen source. After ammonium fixation, the ammonia and ammonium that is formed will be transferred further, during the nitrification process. Aerobic bacteria use oxygen to convert these compounds.
