In the context of typical biology examinations (such as JAMB or WAEC), "peculiar" refers to a characteristic that is unique to mammals or helps distinguish them from other vertebrate groups listed in the options.
Sebaceous glands (oil glands) are microscopic exocrine glands in the skin that are specific to mammals. They are often associated with hair follicles, which are also a unique mammalian trait. While mammary glands are the most cited "peculiar" trait, sebaceous glands are also a diagnostic feature of mammalian skin that distinguishes them from birds, reptiles, amphibians, and fish.
There is an explanation video available below.
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