Which of the following is NOT included in the | vedclass

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(A) The exoskeleton of mammals consists of structures derived from the epidermis,such as hair,nails,claws,hooves,and horns. Quills are modified hairs

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Quills

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(A) The exoskeleton of mammals consists of structures derived from the epidermis,such as hair,nails,claws,hooves,and horns. Quills are modified hairs found in certain mammals like porcupines. However,in the context of standard biological classification and typical anatomical structures of mammals,'Quills' are considered a specialized form of hair,whereas 'Horns' (specifically true horns) are bony outgrowths covered by a keratinous sheath. In many multiple-choice contexts regarding mammalian exoskeleton components,'Quills' are sometimes distinguished from the primary protective structures like hooves,nails,and horns. However,strictly speaking,all these are epidermal derivatives. Given the standard options,'Quills' is the most appropriate answer as they are specialized hairs rather than a distinct category of protective exoskeleton like the others.

Which of the following is $NOT$ included in the exoskeleton of mammals?

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