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series of interlinked food chains by which energy circulates within an ecosystem.
the process whereby substances dissolved in the blood (such as H+ ions, nitrogenous waste and...
the kingdom of multicellular organisms that contain chlorophyll and make their own food by...
specialised cells which secrete mucus, usually found together with columnar epithelium and...
the field of study that provides scientific names for organisms, describes them, preserves...