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Biology, 20.08.2019 12:30 edjiejwi

Two characteristics used to define mammals include
a. mammary glands and scales.
b. mammary glands and hair or fur.
c. mammary glands and sweat glands.
d. sweat glands and a four-chamber heart.

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Two characteristics used to define mammals include
a. mammary glands and scales.
b. mamma...
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