Monotremes,like the Duck-Billed Platypus,are Egg-Laying Mammals (Oviparous)covered in Hair,have Mammary

question 19

Multiple Choice

Monotremes,like the duck-billed platypus,are egg-laying mammals (oviparous) covered in hair,have mammary and skin glands,three ear ossicles,are diphyodont (their permanent teeth replace their "baby" teeth) ,and possess dentary-squamosal jaw articulation (the jaw bone hinges with the squamosal bone of the skull) .Marsupials,such as kangaroos and koalas,are pouched mammals that have a vertical tympanic membrane in addition to being covered in hair,have mammary and skin glands,three ear ossicles,are diphyodont,and possess dentary-squamosal jaw articulation.Eutherians are the placental mammals that most people easily recognize as mammals.They are covered in hair,have mammary and skin glands,three ear ossicles,are diphyodont,possess dentary-squamosal jaw articulation,and have a vertical tympanic membrane. What one shared derived trait sets marsupials and eutherians apart from monotremes?

• A)being diphyodont
• B)having a vertical tympanic membrane
• C)having a dentary-squamosal jaw
• D)being covered in hair

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