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that part of the Earth where all living organisms occur.
part of the skeleton consisting of the skull, vertebral column, sternum and ribs.
thin-walled or slightly strengthened, elongated phloem cells that conduct food substances.
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
molecule that forms when carbon dioxide attaches itself to the amino group of a haemoglobin...