It Is Possible That the Middle Ear Fully Separated from the Lower

question 19

Multiple Choice

It is possible that the middle ear fully separated from the lower jaw at least twice within the mammalian lineage. Evidence of this convergent evolution comes from

• A) a new fossil of a monotreme-like mammal with the bones of its middle ear still connected to its lower jaw.
• B) a new fossil of a therian-like mammal with the bones of its middle ear still connected to its lower jaw.
• C) a new fossil of a monotreme-like mammal with the bones of its middle ear fully separated from its lower jaw.
• D) There is no evidence; the mammalian middle ear could only have evolved once.

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