The structure above represents a quill feather. The structure labelled ‘M’ is the

The structure above represents a quill feather. The structure labelled ‘M’ is the
  • A.
    quill
  • B.
    rachis
  • C.
    superior umbilicus
  • D.
    inferior umbilicus
  • E.
    aftershaft
Correct Answer: Option C
Explanation
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