Answer:
your answer is letter D or ulcer
Yes they do because a nucleus is the control center of all unicellular organisms and multicellular organisms.
The final aspect of the nitrogen cycle is the process of denitrification. In that process, varies organism like microscopic bacteria, and fungi decompose the nitrate in the soil into nitrogen gas which they release into the air.
From https://www.cas.miamioh.edu/mbi-ws/biogeochemicalcycles/Nitrogen/nitrogen.htm
The occlusion of the y-port could cause laryngeal, or a trauma to the tracheal mucosa. Any foreign object that touches the air passages, especially with an occluded tracheotomy tube can damage or block the airways. It is important to do this procedure with care.