Final answer:
The three mechanisms of peramorphosis are hypermorphosis, acceleration and predisplacement. Thus, the option not included is Postdisplacement.
Step-by-step explanation:
The question is referring to the mechanisms of peramorphosis, an evolutionary developmental biology concept. Specifically, it is asking which of the four options given is not a mechanism of peramorphosis. Peramorphosis is a process in which the development of an organism is extended beyond the typical stopping point, leading to additional growth or changes in shape or structure.
The three mechanisms of peramorphosis are hypermorphosis, acceleration, and predisplacement. Hypermorphosis refers to an extension of the development period, allowing the organism to mature beyond the typical endpoint. Acceleration is when developmental processes occur more quickly than usual, leading to the early onset of adult features. Predisplacement refers to the onset of certain developmental features starting earlier in an organism's lifecycle.
Therefore, the answer to the question is Postdisplacement, which is not a mechanism of peramorphosis. In contrast to predisplacement, postdisplacement refers to the delayed onset of certain developmental features, which is not a form of peramorphosis.
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