What is the primary feature of the cap stage during tooth development?

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Shape differentiationFunctional polarity inversionDevelopment of the periodontal ligamentElevated cell division ratesInitiation of enamel secretion

Explanation

The cap stage of tooth development is mainly distinguished by a rise in mitotic activity, which promotes the growth and shaping of the tooth germ. Other processes like morphodifferentiation and polarity changes occur in different stages.