Earth's Changing Environment: Compton's by Britannica - download pdf or read online

By Encyclopedia Britannica Editorial

ISBN-10: 1593394292

ISBN-13: 9781593394295

ISBN-10: 1593395000

ISBN-13: 9781593395001

Very good source for contemporary info on many alternative technology and social experiences subject matters relating to the environment. transparent causes and descriptions,vivid images and illustrations; this ebook will certainly spike an curiosity in older youngsters and adults wishing to benefit extra concerning the adjustments that we're experiencing in our surroundings.

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2008 Encyclopædia Britannica, Inc. ECOLOGY The way a population is spaced across an area is driven largely by food supply and other resources. In uniform distribution, organisms are spread out in a fairly regular pattern. This occurs often where individuals must compete for a limiting resource, such as water or light. Desert shrubs and redwood trees grow in a uniform distribution—shrubs compete for water, while redwoods compete for light. Random distribution occurs where resources are distributed evenly or sporadically.

Amount of shade on the ground or the mineral The latter will mature into a pine forest, which may composition of the soil. These changes allow other species that are adapted to the changed habitat to invade stand for about 100 years before giving way to a climax and succeed the old species, which usually cannot live in community of hardwoods. © 2008 Encyclopædia Britannica, Inc. ECOLOGY Primary succession begins in barren areas, such as the bare rock exposed by a retreating glacier. The first inhabitants are lichens or plants that can grow on bare rock.

All green plants are producers that undergo photosynthesis, as are algae and certain kinds of microscopic organisms, such as cyanobacteria (formerly called blue-green algae). A second and much rarer kind of producer gets its energy not from sunlight but from chemicals, through a process called chemosynthesis. These producers include microscopic organisms living at extreme conditions at volcanic vents in the deep-sea floor and in rock deep underground. All other living things—including all animals, all fungi, and many bacteria and other microorganisms— depend on producers as sources of energy and nutrients, either directly or indirectly.

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