What animal has a two-chambered heart?

Answer

Fish have 2 chambered hearts. Most amphibians and reptiles have 3 chambers in their hearts, although crocodile hearts have 4 chambers. Birds and mammals are animals with 4 chambered hearts.
Reference:
Q&A Related to "What animal has a two-chambered heart?"
Fish.
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All mammals, all birds, and some reptiles (Crocodilians) Too bad that's not one of your choices.
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