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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 Sleep-dependent memory processing
The sleep cycle, memory systems, and memory stages. (a) The human sleep cycle. Across the night, rapid eye movement (REM) sleep and non-REM (NREM) sleep cycle every 90 minutes in an ultradian manner (that is, occurring in cycles that are repeated…
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from article Sleep-dependent memory processing
Sleep-dependent motor skill learning. (a) Wake first. After morning training (10 a.m., clear bar), subjects showed no significant change in performance when tested after 12 hours of wake time (10 p.m., clear bar). However, when tested again…
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from article Sleep-dependent memory processing
Sleep-dependent integration of human relational memory. (a) Delayed inference (associative) memory performance (% correct) in a relational memory task following different offline delays. Immediate testing after just a 20-min offline delay…
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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 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.…
