Examlex
If Mercury has an orbital period of about 88 days, what is its average distance from the Sun?
Criteria
Standards, rules, or tests by which something can be judged or decided, used to make evaluations or decisions.
HIV Spread
The transmission of the Human Immunodeficiency Virus, which can occur through unprotected sex, sharing needles, or from mother to child during birth or breastfeeding.
Research
The systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions.
HIV Infections
The condition caused by the human immunodeficiency virus, which attacks the immune system, potentially leading to AIDS if untreated.
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