b
They are vestigial structures.
Look at the following image of parts of a whale.
Image
In humans, the pelvis and femur, or thigh bone, are involved in walking. What is true about the pelvis and femur in living whales?
a
They are examples of fossils.
b
They are vestigial structures.
c
They are acquired traits.
d
They are examples of natural variation.
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