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...system The terms latitude and longitude are used to identify the position of particular places on the Earth. On most maps you can see vertical and horizontal lines to divide up regions. Lines that run from east to west in the maps are called lines of latitude, and the lines that run north to south are called lines of longitude. You can see this in Figure 4, where the...

...systems with control mechanisms different from, or with the ability to override, those which operate in the seasons when the animal is euthermic; biochemical and cellular control mechanisms capable of protecting tissues against damage, and compensating for energetic and metabolic disadvantages which are manifested at low body temperatures. The terminology used to describe...

...system. One such bacterium, Escherichia coli (E. coli), has various strains, most of which are non-pathogenic and exist in human and animal intestines in a symbiotic relationship, making substances needed by humans and animals. The presence of E. coli in river water is therefore a useful indication of faecal pollution. The coliform count (the number of coliform bacteria,...