Answer:
Denitrification completes the nitrogen cycle by converting nitrate (NO3-) back to gaseous nitrogen (N2). Denitrifying bacteria are the agents of this process. These bacteria use nitrate instead of oxygen when obtaining energy, releasing nitrogen gas to the atmosphere
Answer:
<h2><u>Phagocyte</u></h2>
Explanation:
Alfred Wegener is the father of the plate tectonic theory.
B, there are many ethical issues associated with stem cells.