Another way to show the evolutionary relationships between these animals is
by drawing a cladogram. Here are two cladograms
giving different versions of evolutionary events:
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Cladogram 1
If these are the correct relationships, then milk glands
and hair must have both evolved on two separate occasions, once in moles and once
in bats. |
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Cladogram 2
If these are the correct relationships, then wings must
have evolved independently on two separate occasions, once in bats and
once in birds. |
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