Which of the following is true?

1
 Amphibians have a 3-chambered heart with two atria and a single ventricle
2
Fishes have a 3-chambered heart with two atria and a single ventricle.
3
Amphibians have a 3-chambered heart with a single atria and two ventricles.
4
 Fishes have a 3-chambered heart with a single atria and two ventricles.

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