This greatly extended and evaginated, or protruding, part is what becomes the wing.
2.
In lizards and snakes, males possess paired erect, a hemipenis is evaginated ( turned inside out ) through muscle action and engorgement with blood.
3.
Also, budding ( external or internal ) is present in some worm like Echinococci; these worm produce cyst and then produce ( invaginated or evaginated ) protoscolex with budding.
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