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Origin of Species, by Charles Darwin

Chapter VII:
Miscellaneous Objections To The Theory Of Natural Selection

Longevity — Modifications not necessarily simultaneous — Modifications apparently of no direct service — Progressive development — Characters of small functional importance, the most constant — Supposed incompetence of natural selection to account for the incipient stages of useful structures — Causes which interfere with the acquisition through natural selection of useful structures — Gradations of structure with changed functions — Widely different organs in members of the same class, developed from one and the same source — Reasons for disbelieving in great and abrupt modifications.

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