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

chromophycota

Science; General science

A division of the plant kingdom (also known as Chromophyta) comprising nine classes of algae: Bacillariophyceae (diatoms), Chrysophyceae (golden or golden-brown algae), Cryptophyceae, Dinophyceae ...

psilotophyta

Science; General science

A division of the plant kingdom consisting of only two genera with three living species, Psilotum nudum , P. complanatum , and Tmesipteris tannensis . Psilotum is widespread in tropical and ...

polypodiophyta

Science; General science

A division of the plant kingdom, commonly called the ferns, which is widely distributed throughout the world but is most abundant and varied in moist, tropical regions. The Polypodiophyta are ...

A division that consists of some 23,000 species of small and relatively simple plants commonly known as mosses, granite mosses, peat mosses, liverworts, and hornworts (see illus. ). The bryophytes ...

chromosome

Science; General science

A DNA-protein complex in the nucleus of eukaryotic cells. Chromosomes were so named because after staining, nineteenth-century light microscopists saw chromosomes as colored bodies in cells. The ...

symbiotic star

Science; General science

A double star system in the late stage of stellar evolution. A symbiotic star is a binary system and not a single star. The symbiotic phase represents a brief span in the life of the binary. ...