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HACTEHA [7]
3 years ago
13

People infected with hiv, the virus that causes the disease aids can become unable to fight off infections by organisms that nor

mally do not harm people. why is this so
Health
1 answer:
Svetllana [295]3 years ago
3 0
HIV stands for Human immunodeficiency virus.
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The trichromatic theory states that there are three receptors in the retina that are responsible for our perception of color. The opponent-process theory states that there are three opposite reacting complexes in our retina that control our perception of color. together the theories explain how we perceive color and how those perceptions are connected to our nerve cells.

Explanation:

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