Which of the following characteristics is ass | vedclass

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(B) The presence of $Pinnae$ (external ears) is a unique and defining characteristic of mammals. $Gills$ are respiratory organs typically found in fis

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Pinnae (External ears)

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(B) The presence of $Pinnae$ (external ears) is a unique and defining characteristic of mammals. $Gills$ are respiratory organs typically found in fish and some amphibians. $Fins$ are appendages used for swimming,primarily found in fish. $Scales$ are typically found on the skin of reptiles and fish. Therefore,the correct option is $B$.

Which of the following characteristics is associated with the group of mammals?

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