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(also called heterotrophic organisms) organisms that are not able to produce their own organic food.
compounds that consist of any combination of elements, but do not usually contain carbon and...
an infectious disease that is widespread in tropical and subtropical parts of the world and is...
regions or bundles of vascular tissue consisting of xylem and phloem separated by cambium.
(also called the carina) in birds is an extension of the sternum (breastbone) which runs along...