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water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
(also called yellow cartilage) type of cartilage that contains many yellow elastic fibres lying...
the form in which carbon dioxide is transported in red blood cells.
(also called an extinction event) the sudden dying out of large number of species over a short...
(also called macromolecules) large, more complex molecules formed when monomers join together....