Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.

زيست شناسى


pearl, jewellery, semi-precious stone, mussel, parasite, mother-of-pearl, pearl fishery, animal, molluscs, Mollusca, biology

موارد مربوط

Freshwater pearl mussel

A species of mollusc widespread in freshwaters.

کربنات کلسیم ( CaCO₃ )

سنگ آهک ماده ای است که به طور گسترده و متنوع استفاده می شود۔


An extinct group of Cephalopoda, with solid external skeletons. They are excellent index fossils.


This animation demonstrates the anatomy of birds through the example of mallards.

جواهرات سلطنتی مجارستان

معروفترین قطعه ی جواهرات سلطنتی مجارستان، تاج مقدس است۔


دگرشکل کریستالی عنصر کربن، سخت ترین ماده شناخته شده است۔

Indian maharaja with his wife (18th century)

Maharajas were Hindu rulers of large regions of India.


A sailing vessel with characteristic lugsails used for both military and trade purposes.

Louis XIV (the Sun King)

The French monarch got his epithet because of his opulent and extravagant lifestyle.

Traditional Arab sailboat (Sambuk)

The largest type of Arab sailboat, most commonly used as trading vessels in the Persian Gulf.

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