Answer:
The earliest known case of infection with HIV-1 in a human was detected in a blood sample collected in 1959 from a man in Kinshasa, Democratic Republic of the Congo. (How he became infected is not known.)
Explanation:
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I think the answer is nervous system and muscular system work together but i could be wrong.
Answer:
It is a concussion
Explanation:
it is a type of brain trauma that is really easy to get and stays with you for a long period of time .
Your lungs. The lungs control your ph balance by releasing carbon dioxide