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.

b. they fed their child with milk from mammary gland and their body are covered up with hair or fur not feather

Answered by thomastheo98 | 2024-06-10

b. mammary glands and hair or fur. things also to classify: feed milk to young, give birth live, and breathe in air, so they have lungs.

Answered by BJthesmartguy | 2024-06-10

Mammals are defined by two key characteristics: mammary glands that produce milk for their young and hair or fur that provides insulation and sensory functions. Therefore, the correct answer is option B, which states 'mammary glands and hair or fur.' These features are essential for mammalian survival and reproduction.
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Answered by thomastheo98 | 2024-12-23