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How long does it take for a platypus egg to develop completely and hatch?

A.28 days of internal formation and 10 days of external incubation
B.15 days of internal formation and 35 days of external incubation
C.24 hours of internal formation and 15 days of incubation
D.The eggs develop within 7 days in the mothers uterus and the babies are hatched almost immediately after laying
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