Biology, list history, is not built with 'if's.

Natural selection is a mechanism for generating an exceedingly high degree of improbability. — Ronald A. Fisher

The tendency to variation in living beings, which all admitted as a matter of fact; the selective influence of condition — Thomas Henry Huxley, The Advance of Science in the Last Half-Century

The fundamental biological variant is DNA. That is why Mendel's definition of the gene as the unvarying bearer of heredi — Jacques Monod, Chance and Necessity

The occurrence of successive forms of life upon our globe is an historical fact, which cannot be disputed; and the relat — Thomas Henry Huxley, The Advance of Science in the Last Half-Century

When one ponders on the tremendous journey of evolution over the past three billion years or so, the prodigious wealth o — Jacques Monod, Chance and Necessity

Even today a good many distinguished minds seem unable to accept or even to understand that from a source of noise natur — Jacques Monod, Chance and Necessity

An irrefutable proof that such single-celled primaeval animals really existed as the direct ancestors of Man, is furnish — Ernst Haeckel, The History of Creation V2: Or the Development of the Earth and Its Inhabitants by the Action of Natural Causes

The ancestors of the higher animals must be regarded as one-celled beings, similar to the Amoebae which at the present d — Ernst Haeckel, The History of Creation V2: Or the Development of the Earth and Its Inhabitants by the Action of Natural Causes

...if an organised body is not in the situation and circumstances best adapted to its sustenance and propagation, then, — James Hutton, Investigation of Principles

(Evolution) general condition to which all theories, all hypotheses, all systems must bow and which they must satisfy he — Pierre Teilhard de Chardin, The Phenomenon of Man

A century ago, people laughed at the notion that we were descended from monkeys. Today, the individuals most offended by — Jacob M. Appel, Scouting for the Reaper

$An evolutionary perspective of our place in the history of the earth reminds us that Homo sapiens sapiens has occupied the planet for the tiniest fraction of that planet's four and a half thousand mil — Richard E. Leakey$

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