D
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Kraken
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Look at the male martens above. The images shown are sorted with younger to the left and older to the right. The differences between them represent stereotypical changes with age in male martens. You can see that even the leftmost marten has all sutures fused, and is an adult. In male martens, the temporalis enlarges over time during adulthood. This probably (according to my theory) drives the observed skeletal changes like wider zygomas and sagittal crest formation. If the same could be applied to humans, then temporalis hypertrophy would increase zygomatic width. What do you think?