Which of the following scales are similar to | vedclass

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(B) Placoid scales are found in cartilaginous fishes (Chondrichthyes) like sharks.These scales are homologous to mammalian teeth because they consist

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Placoid

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(B) Placoid scales are found in cartilaginous fishes (Chondrichthyes) like sharks.These scales are homologous to mammalian teeth because they consist of an outer layer of enamel-like material (vitrodentine) and an inner core of dentine surrounding a pulp cavity.Like teeth,they develop from the dermis and epidermis,making their structure and origin similar to the teeth of mammals.

Which of the following scales are similar to mammalian teeth in structure and origin?

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