MCQ
The unique mammalian characteristics are:
- Apinna, monocondylic skull and mammary glands
- Bhairs, tympanic membrane and mammary glands
- ✓hairs, pinna and mammary glands
- Dhairs, pinna and indirect development
Options (2), (3) and (4) are not correct because, monocondylic skull is present in reptiles and aves whereas mammals have dicondylic skull. Tympanic membrane is present in amphibians also, so it is not considered as unique feature.
Indirect development is not seen in mammals.
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