Which of the following traits are characteristic of all mammals?A.The mother feeds her young with her own milk.B.They walk on two limbs.C.They lay eggs that develop outside the mother's body.D.They breathe through gills.
Question
Which of the following traits are characteristic of all mammals?A.The mother feeds her young with her own milk.B.They walk on two limbs.C.They lay eggs that develop outside the mother's body.D.They breathe through gills.
Solution
The characteristic trait of all mammals is A. The mother feeds her young with her own milk. This is because all mammals have mammary glands that produce milk to nourish their young.
Option B is incorrect because not all mammals walk on two limbs. For example, dogs and cats walk on four limbs.
Option C is incorrect because not all mammals lay eggs that develop outside the mother's body. Most mammals give birth to live young, but there are a few exceptions like the platypus and the echidna, which are egg-laying mammals.
Option D is incorrect because mammals do not breathe through gills. They breathe air through lungs.
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