Nucleolus is located within the nucleus and is site of the ribosomal RNA synthesis
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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Hormones - a chemical realesed by the endocrine system in the bloodstream
The answer is C. Cardiovascular
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