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the outer most layer of tightly packed modified parenchyma cells in plants.
(also called elimination or defecation) the process whereby undigested food remains are expelled...
special chemical molecules that transmit nerve impulses across a synapse.
the tube through which urine passes from the bladder to the exterior.
molecule that forms when carbon dioxide attaches itself to the amino group of a haemoglobin...
multicellular marine algae.