6. What is the distinguishing characteristic of mammals?
A. They have hard scales or shells covering their bodies.
B. They have mammary glands used to feed their young
C. They are characterized by segmented body.
D. They breathe through their skin and lungs
A. They have hard scales or shells covering their bodies.
B. They have mammary glands used to feed their young
C. They are characterized by segmented body.
D. They breathe through their skin and lungs
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Answer:
B. they have mamary glands used to feed their young