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Equisetophyta
(Encyclopedia)Equisetophyta ĕkˌwəsətŏfˈətə [key], small division of the plant kingdom consisting of the plants commonly called horsetails and scouring rushes. Equisetum, the only living genus in this divisi...phosphorylation
(Encyclopedia)phosphorylation, chemical process in which a phosphate group is added to an organic molecule. In living cells phosphorylation is associated with respiration, which takes place in the cell's mitochondr...Williston, Samuel Wendell
(Encyclopedia)Williston, Samuel Wendell, 1851–1918, American paleontologist and entomologist, b. Boston, grad. Kansas State Agricultural College (B.S., 1872) and Yale (M.D., 1880; Ph.D., 1885). He taught at Yale ...Pachycephalosaurus
(Encyclopedia)Pachycephalosaurus păkˌĭsĕfˌəlōsôrˈəs [key] [Gr., = thick-headed lizard], bipedal herbivorous dinosaur of the late Cretaceous period, approximately 68–65 million years ago. Its disting...horizon
(Encyclopedia)horizon, in astronomy, roughly circular line bounding an observer's view of the surface of the earth where the sky and earth seem to meet. This is the visible horizon. At sea the visible horizon is a ...Mojave Trails National Monument
(Encyclopedia)Mojave Trails National Monument, 1.6 million acres (647,000 hectares), SE California. Linking Joshua Tree National Park and Mojave National Preserve, it follows the trails of the Chemehuevi people, a ...weathering
(Encyclopedia)weathering, collective term for the processes by which rock at or near the earth's surface is disintegrated and decomposed by the action of atmospheric agents, water, and living things. Some of these ...gar
(Encyclopedia)gar, member of the family Lepisosteidae, freshwater fishes found in the warmer rivers and lakes of the S United States, Central America, Mexico, and the West Indies. Gars are highly predacious and des...Great Pyrenees
(Encyclopedia)Great Pyrenees, breed of large working dog whose fossil remains date its existence in Europe from the Bronze Age (1800–1000 b.c.). It stands from 25 to 32 in. (63.5–81.3 cm) high at the shoulder a...megatherium
(Encyclopedia)megatherium mĕgəthērˈēəm [key] [Gr.,=large beast], extinct ground sloth, of the genus Megatherium, that was widely distributed in North and South America in the Pleistocene epoch. Fossil evidenc...Browse by Subject
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