Blood coming into the pulmonary capillaries is low in O2 and high in CO2.
D - brisk.
It is basically a synonym for fast and is an adjective which is what is missing .
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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