Formation and Nature of Pearl: Pearl is secreted by the mantle of the pearl oyster as a protection against foreign objects which may be sand particles, minute larval forms or other such things. To study the mode of formation of pearl it is essential to know the structure of the shell and mantle.
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Interesting Facts About Carbon. 1  Diamond and graphite are two forms of carbon. Each have very different properties. 2  Life on earth could not exist without carbon. It is part of DNA and also makes up important sugars and fats that we need to live. 3  The name âcarbonâ comes from the Latin word âcarboâ.