A gradual change in the characteristics of a species or population across different geographical regions or geological zones.
From Greek 'geo-' (earth) and 'kline' (gradient or slope). Coined in the 20th century as biologists mapped genetic and physical variations across landscapes.
A geocline is like nature's color-gradient chart—imagine a bird species getting steadily larger as you travel north, or darker as you move to shadier forests. It's evolution happening visibly across space.
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