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In humans, the medulla region of the brain is mainly responsible for the regulation process of respiration. It is also called the respiratory rhythm centre. The chemosensitive area located near the respiratory centre sends signals across nerve impulses to alter the rate of expiration to eliminate compounds.
D. Certain genes are turned on and others are turned off; this action produces adult cells that are specialized
If its a mutiple choice question ya got then VITAMINS should be the answer