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kingdom of multicellular eukaryotic organisms that do not have cell walls, feed heterotrophically and are motile. All higher animals reproduce sexually.
living ground tissue with thick-walled cells that gives strength, support and protection to a...
the clear colourless fluid that occurs in the spaces, such as the ventricles and central canal,...
the body system concerned with the digestion and absorption of nutrients.
unicellular organisms that contain a true nucleus and membrane bound organelles. All protists...