Plural of dimorphism; the quality or condition of existing in two distinct forms.
From Greek 'di-' (two) plus 'morph' (form) plus '-ism' (condition or practice) plus plural '-s'. Dimorphism became a key concept in 19th-century biology.
Dimorphisms are so important in evolution that Darwin himself studied them extensively—the fact that a species can have two totally different body types taught scientists that diversity happens within species, not just between them.
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