General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

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General science

ascidiacea

Science; General science

A class of Tunicata which occurs as solitary zooids or, by a process of asexual budding, develops into colonies. Zooids vary in length from a few millimeters to 10 in. (25 cm). Individuals or ...

A class of vermiform marine mollusks covered by a cuticle invested with innumerable calcareous spicules; also known as solenogasters. There are 277 named species. Most species are less than 0.4 in. ...

oligochaeta

Science; General science

A class or subclass (depending on the classification system used) of worms, including the earthworms, within the phylum Annelida. These animals exhibit both external and internal segmentation—that ...

polyplacophora

Science; General science

A class within the phylum Mollusca whose members are popularly called chitons, coat-of-mail shells, or sea cradles. Polyplacophora, or Loricata, was formerly combined with Aplacophora in the class ...

acanthocephala

Science; General science

A distinct phylum of helminths, the adults of which are parasitic in the alimentary canal of vertebrates. They are commonly known as the spiny-headed worms. The phylum comprises the orders ...

polypteriformes

Science; General science

A distinctive and apparently ancient order of actinopterygian fishes comprising the subclass Cladistia, commonly known as bichirs and reedfishes. The following combination of characters distinguishes ...

lighthouse

Science; General science

A distinctive structure, built on or near a shore, which exhibits a light of distinctive characteristics to serve as an aid to navigation (see illus. ). Lesser lights may be displayed from fixed ...