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the elimination of the waste products of metabolism from the body.
nutrients are obtained by digesting organic compounds that have to be acquired and ingested by...
all the different living organisms on the Earth from the smallest micro-organisms to the largest...
an infection of the skin, caused by a parasitic fungus. It causes cracked, inflamed and itchy...
molecule that forms when carbon dioxide attaches itself to the amino group of a haemoglobin...
the field of study that provides scientific names for organisms, describes them, preserves...