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an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases, stabilise body temperature and pH, and to maintain homeostasis.
a very long time span in the Earth's history, covering tens or hundreds of millions of years....
the formation of layers of water of different temperatures in large bodies of water - dams,...
liquid that drains out of a landfill and is contaminated with solutes from the waste matter