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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.
meat from animals that have been slaughtered according to Muslim law.
the immunity with which an organism is born.
single-celled organisms with all life functions performed within the cell.
middle body tissue layer that forms the muscular, circulatory and excretory systems.
plant that lives for one year or season.