Number b I think is right
<span> Sometimes a cell inaccurately duplicates its DNA, and the resulting cells are not identical.</span>
Answer:
efends the body from microorganisms that could cause it harm or even death. one of the additional functions of the immune system. helps maintain homeostasis by removing old and or damaged cells from the body. complex and broad range of defensive mechanisms that the human body uses to combat infections and diseases.
Explanation:
Most of it follows its cycle, going back to the atmosphere.
The image below, shows you how the nitrogen cycle is.
Hope it helped,
Happy homework/ study/ exam!