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Chaetognatha

(Encyclopedia)CE5 Anatomy of an arrow worm, Sagitta, representative of the phylum Chaetognatha Chaetognatha kētôgnăthˈə [key], phylum of predominantly pelagic marine animals commonly known as arrowworms. A...

Padre Island

(Encyclopedia)Padre Island pädˈrē, pădˈrē [key], low, sandy island, c.115 mi (185 km) long, less than 3 mi (4.8 km) wide, S Tex. It is characterized by large, irregular sand dunes, sparse vegetation, and a st...

Stanford University

(Encyclopedia)Stanford University, at Stanford, Calif.; coeducational; chartered 1885, opened 1891 as Leland Stanford Junior Univ. (still the legal name). The original campus was designed by Frederick Law Olmsted. ...

bivalve

(Encyclopedia)CE5 Internal anatomy of a clam, Anodonta, representative mollusk of the class Pelecypoda (the bivalves) bivalve, aquatic mollusk of the class Pelecypoda (“hatchet-foot”) or Bivalvia, with a la...

Galápagos Islands

(Encyclopedia)Galápagos Islands gəlăpˈəgōs [key] [Span.,=tortoises], archipelago and province, 3,029 sq mi ...

Silurian period

(Encyclopedia)Silurian period sĭlo͝orˈēən, sī– [key] [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. I. Murchison], third period of the Pal...

Lysenko, Trofim Denisovich

(Encyclopedia)Lysenko, Trofim Denisovich lĭsĕngˈkō, Rus. trəfēmˈ dyĭnyēˈsəvĭch lĭsyĕnˈkə [key], 1898–1976, Russian agronomist. As president of the Lenin All-Union Academy of Agricultural Sciences ...

Kingsolver, Barbara

(Encyclopedia)Kingsolver, Barbara, 1955–, American writer, b. Annapolis, Md., B.S. DePauw Univ., 1977, M.S. Univ. of Arizona, 1981. She studied biology and ecology and was a science writer before completing The B...

horticulture

(Encyclopedia)horticulture [Lat. hortus=garden], science and art of gardening and of cultivating fruits, vegetables, flowers, and ornamental plants. Horticulture generally refers to small-scale gardening, and agric...

extinction

(Encyclopedia)extinction, in biology, disappearance of species of living organisms. Extinction usually occurs as a result of changed conditions to which the species is not suited. If no member of the affected speci...