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a molecule found inside red blood cells that can carry both oxygen and carbon dioxide.
a collection of tissues joined in a structural unit to serve a common function.
unicellular fungi, most of which reproduce asexually by a process called budding.
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
a plant body consisting of one or more cells. It is not differentiated into root, stem and...