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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.
the process whereby a particular change causes a response which reverses that change.
a molecule that stores large amounts of energy that can be used for metabolic activity.
a structure made mostly of glass, in which temperature and humidity can be controlled for the...
(also called the carina) in birds is an extension of the sternum (breastbone) which runs along...
a space or gap between two teeth. Many species of mammals have diastemata as a normal feature,...