Aquarium guide
Aquarium guide     

  
 
SPONGES
 

SPONGES

Up until the 19th century, naturalists hesitated when classifying sponges: animal or vegetable? It must be admitted, however, that their field of research was extensive, as there are around 10,000 species of sponges.

SPONGES

These very old animals were among the first to appear on earth or, more exactly, in the sea. Freshwater species are rare and are not found in aquariums, but some marine species can be kept in captivity.


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БРЕЙТ (Breit) Грегори (1899-1981) , американский физик. Родился в России, с 1915 - в США. Труды по ядерной физике, теории рассеяния, физике высоких энергий. Предложил (совм. с Ю. Вигнером) формулу, названную их именами. Один из пионеров ускорительной техники.