In animals, the juvenile phase is followed by what changes prior to active reproductive behaviour?

In animals, the juvenile phase is followed by what changes prior to active reproductive behaviour?

In animals, the juvenile phase is followed by what changes prior to active reproductive behaviour?

Option 1 : Morphological changes
Option 2 : Physiological changes
Option 3 : Both (a) and (b)
Option 4 : Genetical changes

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