What Characteristics Separate the Class Mammalia from Other Animals in the Phylum

question 6

Multiple Choice

What characteristics separate the Class Mammalia from other animals in the phylum Chordata?

• A) bipedal locomotion and an upright stance
• B) being heterotrophic and multicellular
• C) dorsal tubular nerve cords and notochords
• D) vertebrates with hair and mammary glands
• E) developed brain and tool use

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Definitions:

Fingernails

Hard, flat structures made of keratin at the tips of fingers, serving protective and functional purposes.

Turgor

The state of being swollen or distended, typically used to describe the elasticity of the skin as an indicator of hydration and health.

Dehydration

A condition resulting from excessive loss of body water, leading to imbalances in essential minerals and electrolytes.

Ptosis

The drooping or falling of the upper eyelid, which can be due to various causes including nerve damage, muscle diseases, or congenital conditions.