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from article Camel
Bactrian camel (Camelus bactrianus). (Photo courtesy of Brent Huffman, Ultimate Ungulate Images)
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from article Plant communication
Hillsides in central California covered by hard chaparral composed almost entirely of chemise shrubs. Chemise (also spelled chamise) produces allelopathic chemicals that, through plant communication, inhibit the germination of seeds and the…
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from article Soil
Soil supports plant growth. A pumpkin seed in nutritious soil sprouts and comes to life. (Credit: Redmal/Getty Images)
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from article Soil
A soil profile showing horizons. This particular soil belongs to the Dothan series of soils, which are very deep, well drained soils that form in thick beds of unconsolidated, medium- to fine-textured marine sediments. (Credit: John A. Kelley,…
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from article Soil
Erosion is an important concern of soil management. The soil along the river bank has eroded significantly, causing riparian trees to fall. (Credit: Hans Engbers, Shutterstock)
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from article Territoriality
The tiger (Panthera tigris) is highly territorial in its behavior. (Credit: Safique Hazarika Photography/Getty Images)
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from article Science
Italian physicist and astronomer Galileo Galilei (1564–1643) founded the modern scientific method of deducing laws to explain the results of observation and experiment. (Credit: Getty Images)
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from article Ecological competition
The competitive exclusion principle can be prevented through resource partitioning and species coexistence. In this illustration, each warbler species prefers to feed at a different height and portion of the tree, thus reducing competition.…
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from article Biosphere
All environments capable of sustaining life above, on, and beneath the Earth's surface, as well as in the oceans, are contained in the biosphere. (Credit: National Aeronautics and Space Administration)
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from article Biosphere
The upper and lower limits of the biosphere are not sharply defined. However, most of the biosphere lies within the zone that is reached by sunlight and where liquid water exists. The mountains shown in this photograph are located in Torres del…
