HIV is a sexually transmitted virus that destroys the blood cells that help the body fight diseases. What would be the most reliable way to detect whether a person has been infected with HIV?

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What are some possible short and long term medical concerns for crew members on longer space exploration trips

The source of energy shown in the image is (renewable, non renewable, polluting) a drawback of building a dam is that (it will destroy ecosystems, it requires fossil fuels, it won’t be useful for irrigation)