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Law Incorporation [45]
3 years ago
6

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

Biology
2 answers:
rewona [7]3 years ago
4 0
Hi there!

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

Hope this helps!
andreev551 [17]3 years ago
3 0
All have a vertebrae or spinal cord
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