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25 Topic Pages Found in Biology and starting with the letter O
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Open Oak

any tree or shrub of the genus Quercus of the family Fagaceae ( beech family). This complex genus includes as many as 600, found chiefly in north

Open Obsessive-compulsive disorder
Obsessive-compulsive disorder

Obsessions and the compulsive behaviors often associated with them are symptoms of an obsessive-compulsive disorder (OCD). Like many other mental

Ochoa, Severo, 1905-1993

Spanish-born US biochemist who was awarded a Nobel Prize for Physiology or Medicine in 1959 for the discovery of enzymes that catalyse the formation

Open Octopuses

Soft-bodied sea animal with a round or oval body and eight slender arms (tentacles) in a ring surrounding its mouth. They are solitary creatures,


common name for an owllike, cave-dwelling bird, Steatornis caripensis, belonging to the family Steatornithidae. It spends its days in dark caves,

Open Okra

Okra ( Abelmoschus esculentus ) is a member of the mallow family, relished for its mucilaginous pods that thicken soups and stews . When picked young,

Open Olive

common name for the Oleaceae, a family of trees and shrubs (including climbing forms) of warm temperate climates and of the Old World tropics,

Open Omnivores

Animal that feeds on both plant and animal material. Omnivores have digestive adaptations intermediate between those of herbivores and carnivores ,


plant of the family Liliaceae ( lily family), of the same genus (Allium) as the chive (A. schoenoprasum), garlic (A. sativum), leek (A. porrum), and


abstract The phylum Onychophora, also known as 'peripatus', 'velvet worms' or 'walking worms', comprises over 180 described species. Onychophorans are