Image: Lamarck's Two-Factor Theory
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Description: Lamarck's two-factor theory involves 1) a complexifying force that drives animal body plans towards higher levels (orthogenesis), and 2) an adaptive force that causes animals with a given body plan to adapt to circumstances (use and disuse, inheritance of acquired characteristics). Popular views of Lamarckism only consider an aspect of the adaptive force.
Title: Lamarck's Two-Factor Theory
Credit: Own work
Author: Ian Alexander
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License: CC BY-SA 4.0
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