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Q. How are artificial and natural pearls created?
Pearls are made from small strange particles that deposit between the mantle and the shell of the oyster. These particles trigger a defense process by the organism and they are gradually covered by calcium carbonate layers secreted by the oyster thus giving birth to pearls.
In the artificial production of pearls a small fragment of shell covered with mantle pieces is inserted between the mantle and the shell of an oyster and a pearl is formed around the graft.
What is the histological nature of the glands? How are they formed? The glands are epithelial tissues. They are made of epithelium that throughout the embryonic development inv
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a) What is meant by 'vaso-dilation'? b) What are the effects of vaso-dilation in the skin? (a) Vaso-dilation is an enhance in diameter of small arterioles and
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