Aquarium guide
Aquarium guide     

  
 
THE MAIN INVERTEBRATE GROUPS
 

THE MAIN INVERTEBRATE GROUPS

The invertebrates, as their name indicates, have no backbone. Their body is soft, but it is protected on the outside, by a carapace in the case of the crustaceans, or by a shell in mollusks, or it is supported by an internal calcareous skeleton, as in corals.

Although they are considered less evolved animals than the vertebrates - the group to which fish belong - invertebrates sometimes adapt in surprising ways to ensure their survival. The crustaceans, for example, can walk or swim to look for food or flee an enemy, while corals and anemones unfurl to capture microparticles, such as plankton, in open water, or retract to escape their predators.


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ЭРДМАН Николай Робертович (1900-70) , русский драматург. Гротескно-сатирическое изображение индивидуализма, воинствующего хамства в антимещанских драмах "Мандат" (1925), "Самоубийца" (опубликовано в 1987). Сценарии фильмов, в т. ч. "Веселые ребята" (1934, совместно с Г. Александровым и В. Массом), "Смелые люди" (1950; Государственная премия СССР, 1951).