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molecule that forms when carbon dioxide attaches itself to the amino group of a haemoglobin molecule
series of interlinked food chains by which energy circulates within an ecosystem.
(also called transgenic organism) an organism whose genetic material has been changed using...
the movement of respiratory gases across a respiratory surface.
a thick layer inside the primary cell wall. It consists mainly of cellulose, hemicellulose and...
an informal term for any living species which appears to be the same as a species otherwise only...