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A xerocole (from Greek xēros / ˈ z ɪ r oʊ s / 'dry' and Latin col(ere) 'to inhabit'), [2] [3] [4] is a general term referring to any animal that is adapted to live in a desert. The main challenges xerocoles must overcome are lack of water and excessive heat. To conserve water they avoid evaporation and concentrate excretions (i.e. urine and ...
Darwin's work established evolutionary descent with modification as the dominant scientific explanation of natural diversification. [16] In 1871, he examined human evolution and sexual selection in The Descent of Man, and Selection in Relation to Sex, followed by The Expression of the Emotions in Man and Animals (1872).
Agassiz was a well-known natural scientist of his generation in America. [68] In addition to being a natural scientist, Agassiz wrote prolifically in the field of scientific polygenism after he came to the United States. Upon arriving in Boston in 1846, Agassiz spent a few months acquainting himself with the northeast region of the United ...
This evolutionary process has been named "pristification". [131] Underwater camouflage is found independently in many fish like: leafy seadragon (large part of its body is just for camouflage), pygmy seahorse, leaf scorpionfish, flounder, peacock flounder. Some have active camouflage that changes with need. [132]
The “Black Beauty” meteorite opened a window into studying ancient Mars when it was found in the Sahara Desert in 2011. Astronomers believe the space rock was ejected from the Martian surface ...
They are among the wonders of our deserts: star dunes, the vaguely pyramid-shaped sand formations up to about 1,000 feet (300 meters) tall with arms stretching out from a central peak to give them ...
Starting with Charles Darwin, many scientists have conducted experiments and made observations that have shown that the types of animals and plants found, and not found, on such islands are consistent with the theory that these islands were colonized accidentally by plants and animals that were able to reach them. Such accidental colonization ...
Desert ecology is the study of interactions between both biotic and abiotic components of desert environments. A desert ecosystem is defined by interactions between organisms, the climate in which they live, and any other non-living influences on the habitat. Deserts are arid regions that are generally associated with warm temperatures; however ...