Developmentally, what common feature unites scales and feathers and hair. What are they made of?
Added by Brian S.
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All three structures are forms of integumentary systems found in animals, serving protective and insulating functions. Show more…
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The scales of non-avian reptiles, the feathers of birds, and the hair of mammals all develop from the epidermis and are formed by the same protein (keratin). Knowing that the most recent common ancestor of these animals was scale bearer; scales, feathers and hairs can be considered Select one: orthologous homologous analogous heterologous paralogous
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