Answer:
Cell
Explanation:
A cell is the smallest unit of a living thing.
Cells divide in an effort to reproduce and create more of themselves to keep their larger- encompassing species sustained.
The condition is which characteristics of atmosphere III is nitrogen-rich and oxygen-poor. Nitrogen-rich is one of the condition in which the atmosphere III characterizes. The other is oxygen-poor, is one of the condition characterizes atmosphere III. Nitrogen-rich material mostly called green because they are greenish in color. Oxygen-poor means the blood enters the RA or Right atrium or the upper chamber of the heart.
