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13. Which of the following is the common characteristic of fishes, birds, mammals, reptiles, and amphibians?
E. They are vertebrates.
F. They are invertebrates.
G. They are all warm-blooded.
H. They possess mammary glands. ​

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13. Which of the following is the common characteristic of fishes, birds, mammals, reptiles, and amphibians?

E. They are vertebrates.


The group of animals mentioned above are all vertebrates. Vertebrates animals refers to those organism who have backbones.