Which one of the following is not a mammalian character?
Presence of milk-producing glands
Presence of two pairs of limbs
Presence of hair on the skin
Presence of external ears called pinnae
Homodont type of dentition
A
Presence of milk-producing glands
B
Presence of two pairs of limbs
C
Presence of hair on the skin
D
Presence of external ears called pinnae
E
Homodont type of dentition
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Solution
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The presence of milk-producing glands (mammary glands), external and middle ears, two pairs of limbs, and skin with hair are some of the characteristic features of mammals.
Most vertebrates, except mammals, have homodont teeth (anatomically and functionally similar teeth) while mammals possess heterodont teeth (different types of teeth with different functions).
Thus, the correct answer is option E.
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