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Two characteristics used to define mammals include

Amammary glands and scales.
Bmammary glands and hair or fur.
Cmammary glands and sweat glands.
Dsweat glands and a four-chamber heart.

Verified Answer :

BJthesmartguy
Bmammary glands and hair or fur. things also to classify: feed milk to young, give birth live, and breathe in air, so they have lungs.
thomastheo98
Bthey fed their child with milk from mammary gland and their body are covered up with hair or fur not feather

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