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Q: Crocodiles have a –––––– chambered heart.
  • A. Three
  • B. One
  • C. Four
  • D. Two
Correct Answer: Option C - Most reptiles have two atria and one ventricle. The only exceptions are the 23 living species of crocodilians (alligators, caimans, crocodiles and gharials) who, like birds and mammals, have four chambered hearts with two atria and two ventricles.
C. Most reptiles have two atria and one ventricle. The only exceptions are the 23 living species of crocodilians (alligators, caimans, crocodiles and gharials) who, like birds and mammals, have four chambered hearts with two atria and two ventricles.

Explanations:

Most reptiles have two atria and one ventricle. The only exceptions are the 23 living species of crocodilians (alligators, caimans, crocodiles and gharials) who, like birds and mammals, have four chambered hearts with two atria and two ventricles.