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| mode of organization; construction and arrangement of tissues, parts, or organs |
| any alteration in the structure of an organism resulting from natural selection, by which the organism becomes more able to survive in its environment |
| cline (klīn) Pronunciation Key
A gradual change in an inherited characteristic across the geographic range of a species, usually correlated with an environmental transition such as altitude, temperature, or moisture. For example, the body size in a species of warm-blooded animals tends to be larger in cooler climates (a latitudinal cline), while the flowering time of a plant may tend to be later at higher altitudes (an altitudinal cline). In species in which the gene flow between adjacent populations is high, the cline is typically smooth, whereas in populations with restricted gene flow the cline usually occurs as a series of relatively abrupt changes from one group to the next. |