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It is unlikely that gene duplication events in the Hox complex played a role in the adaptive radiation of animals. A) The new gene copies led to lower metabolic rates. B) The new gene copies helped facilitate the evolution of more complex body plans. C) The new gene copies helped facilitate the evolution of smaller bodies.

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Answer: C & A

Explanation:

The HOX genes encodes important transcription factors. This factors causes protein to be made that specify cell fate and identify; embryonic primary axis, secondary axis and plays important roles in various tracts development.

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