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the remains of digestion, which are eliminated from the body via the anus, and contain undigested food and bile pigments.
unicellular organisms that contain a true nucleus and membrane bound organelles. All protists...
the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from...
a molecule found inside red blood cells that can carry both oxygen and carbon dioxide.
an antigen preparation that stimulates the immune system to give protection against a particular...