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Unformatted text preview: lining and causes a severe form of diarrhoea. Cryptosporidium occurs in water that has not been treated to make it fit for drinking. Cryptosporidium causes cryptosporidiosis - a short-lived diarrhoeal disease. Multicellular animals carry out their living processes by means of speed organs and tissues; the digestive system, nervous system, muscular system etc. The cells in these organs are speed for a particular function. Muscle cells can contract, nerve cells conduct impulses, gland cells secrete enzymes or hormones. These speed cells cannot survive on their own. They need other cells or systems to supply them with food and oxygen and to remove their waste products. The single-celled animals can carry out all these vital functions. They grow, feed, breathe, reproduce, excrete all within the cell though certain parts of the cytoplasm may be speed to carry out special functions; the contractile vacuole for example. D.G. Mackean pseudopodia pseudopodia...
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- Fall '11