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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.
stage of photosynthesis that does not require light energy to occur.
a substance found in certain fatty foods or manufactured in the liver. High levels of...
a fine thread-like structure. In plants: the stalk of the male sexual organ.
an informal term for any living species which appears to be the same as a species otherwise only...