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organic compound that always contains the elements carbon, oxygen and hydrogen. The building blocks (monomers) are monosaccharides.
the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.
the introduction of harmful substances (pollutants) into the environment.
the first part of the intestine, from the pyloric valve of the stomach to the caecum. It...
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.