Examlex
Since the 1960s, where has the largest proportion of migrants to Tibet and the western provinces of China come from?
AIDS
Acquired Immunodeficiency Syndrome, a life-threatening condition caused by the human immunodeficiency virus (HIV), leading to a severely weakened immune system.
Outdoor Pollutants
Harmful substances present in the outdoor environment, often resulting from industrial activities, vehicle emissions, and natural sources, leading to air, water, and soil pollution.
Major Classes
Principal categories or groups into which items, organisms, or concepts are divided based on shared characteristics or properties.
Carbon
A nonmetallic chemical element with symbol C, atomic number 6, and is the basis of all known life on Earth, playing a critical role in the structure, biochemistry, and climate of our planet.
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