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the body system concerned with the digestion and absorption of nutrients.
reproductive or sex cells that contain the haploid set of chromosomes. The male gametes are...
an international agreement to phase out the use of CFCs, signed by 49 countries in Montreal,...
(also called secondary meristems) regions of cells capable of dividing to form new cells in the...
specialised proteins which catalyse chemical reactions and thereby speed up chemical reactions...
external opening of the rectum (part of the mammalian digestive tract) through which faeces are...