Isolating mechanisms are biological properties of individuals that prevent the interbreeding of — Ernst Mayr
A species is a reproductive community of populations reproductively isolated from others — Ernst Mayr
Definitions are temporary verbalizations of concepts, and concepts- particularly difficult concepts- are — Ernst Mayr
Every politician, clergyman, educator, or physician, in short, anyone dealing with human — Ernst Mayr
Evolution, thus, is merely contingent on certain processes articulated by Darwin: variation — Ernst Mayr
Anyone who writes about “Darwin’s theory of evolutionin the singular, without segregating — Ernst Mayr
Paleontologists had long been aware of a seeming contradiction between Darwin’s postulate — Ernst Mayr
Living in an entirely different physical as well as biotic environment, such a population would have — Ernst Mayr
Indeed, I was unable to find any evidence whatsoever of the occurrence of a drastic evolutionary — Ernst Mayr
In those early years in new york when I was a stranger in a big city, it was the companionship and later — Ernst Mayr
It seems to me that for darwin the pulsing of evolutionary rates was a strictly vertical phenomenon. — Ernst Mayr