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in plants: the female reproductive organ of the flower where the ovules are formed.
a species that is not indigenous.
small air-filled sac-like structures from which the lungs are made
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
an international agreement to phase out the use of CFCs, signed by 49 countries in Montreal,...
(also called herbivore) an animal that feeds directly on plant matter.