high tide and low Tides on the level of this and they never stand still as the result of this phenomenon the level of the sea on keeps either rising or falling which of these Heights do we take as the sea level or 0 metre height? in order to solve this problem the level of the sea is carefully measured of frequency internals and mean levels of the sea is calculated . over a period. scientist observed the high and low levels of the sea and they have come to one calculate average level which is known as mean sea level (M.S.L)
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The color of animals is by no means a matter of chance; it depends on many considerations, but in the majority of cases tends to protect the animal from danger by rendering it less conspicuous. Perhaps it may be said that if coloring is mainly protective, there ought to be but few brightly colored animals. There are, however, not a few cases in which vivid colors are themselves protective. The kingfisher itself, though so
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