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Fishes, amphibians, reptiles, birds, and mammals all have an internal skeleton with a _______. Fill in the blank.

User Bluelovers
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2 Answers

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All have a vertebrae or spinal cord
User Stephane Gosselin
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Hi there!

I believe the answer is a spinal cord - all of these animals are vertebrates.

Hope this helps!
User Vocaloidict
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