Solve this multiple-choice question and choose the correct option.

Mammalian diversity — monotremes: Monotremes are unique among mammals because they… Context: Compare reproductive modes across mammalian subclasses. Choose the correct distinguishing feature.

Difficulty: Easy

Lay eggs (are oviparous) despite being mammals
Lack hair and mammary glands
Have gills throughout life
Are exclusively volant (capable of powered flight)

Correct Answer: Lay eggs (are oviparous) despite being mammals

Explanation:

ConceptMonotremes (platypus, echidnas) are egg-laying mammals; they possess hair and produce milk but lack nipples (milk secreted onto skin). They are not gilled or flying mammals.

Final AnswerThey lay eggs (oviparous).

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