Answer:
A structure in the cell nucleus that contains DNA, histone protein, and other structural proteins.
Explanation:
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Traits such as skin color and height are variable throughout the human population because these traits are controlled by more than one cell. The cells don't perform at the same rate and don't produce the same biomolecules. Therefore, the maximum height of a person is not achieved which results to variations.
Answer: Tobacco/Smoke
Explanation:
When it goes into your lungs, it affects you causing a way to have difficulty breathing.