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Which bones of the whale skull have become extremely elongated and is this true of the sea lion, a member of the Card in for you which has become aquatic?

Which bones of the whale skull have become extremely elongated and is this true of-example-1

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The mandible bones have become extremely elongated in the whale.

This is not true for the sea lion, its skull has remaind with short mandible bones even though it has other adaptations for acuatic life.