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drought
drought abnormally long period of insufficient rainfall. Drought cannot be defined in terms of inches of rainfall or number of days without rain, since it is determined by such variable factors as the distribution in time and area of precipitation during and before the dry period. Since ancient... Read more |
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Sahel
Sahel , name applied to the semiarid region of Africa between the Sahara to the north and the savannas to the south, extending from Senegal and Mauritania on the west, through Mali, Burkina Faso, Niger, N Nigeria, Chad, and Sudan, to Ethiopia and Eritrea on the east. Beginning in the late 1960s the... Read more |
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carnauba
carnauba , wax obtained from the wax palm, or carnauba ( Copernicia cerifera ), of Brazil. It is secreted by the leaves, apparently in defense against the hot winds and droughts of its native habitat, and the resultant coating is removed by drying and flailing. The hardest, highest-melting natural... Read more |
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aestivation
aestivation 1. (in zoology) A state of inactivity occurring in some animals, notably lungfish, during prolonged periods of drought or heat. Feeding, respiration, movement, and other bodily activities are considerably slowed down. See also dormancy. Compare hibernation. 2. (in botany) The arrangement... Read more |
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desert biome
desert biome The characteristic biotic community of warm, arid regions, generally defined as areas with rainfall of less than 250 mm/yr. Characteristically, such areas have high evaporation rates and a large diurnal temperature range. Organisms commonly show adaptations to drought and heat, e.g.... Read more |
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Jojoba oil
Jojoba oil Description Jojoba (pronounced ho-ho-ba) oil is a vegetable oil obtained from the crushed bean of the jojoba shrub (Simmondsia chinenis ). The jojoba shrub is native to the Sonoran Desert of northwestern Mexico and neighboring regions in Arizona and southern California. It grows in... Read more |
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Sociobiology
Sociobiology In the Origin of Species (1859), Charles Darwin argued that the main mechanism of evolutionary change is a process he called natural selection. More organisms are born than can survive and reproduce, bringing on a struggle for existence. Given naturally occurring variation, there... Read more |
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tolerance
tolerance 1. The ability of an organism to withstand extreme variations in environmental conditions, such as drought. 2. The build-up of resistance to drugs or other chemicals (such as pesticides), which occurs after prolonged use or application. Increasingly large doses of the chemical are required... Read more |
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phanerophyte
phanerophyte One of Raunkiaer's life-form categories, being a plant whose perennating buds or shoot apices are borne on aerial shoots. Such plants are the least protected of those in Raunkiaer's scheme and therefore are most typical of environments where drought, cold, and exposure to strong winds... Read more |
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Gabonese
Gabonese PRONUNICATION:gab-uh-NEEZ LOCATION:Gabon (western Central Africa) POPULATION:About 1.2 million LANGUAGE:French; 45 local Niger-Congo languages RELIGION:Roman Catholicism; Protestantism; Islam; animism 1 • INTRODUCTION Gabon's stability keeps it in the shadows.... Read more |
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