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active during the day.
the blood circuit from the heart to the body and back to the heart.
the muscular tube of the mammalian digestive tract that links the mouth to the stomach.
a relationship between two different organisms, of different species, from which at least one of...
a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...
the kingdom of multicellular organisms that contain chlorophyll and make their own food by...