Which of the following is true of vertebrates with four-chambered hearts? there is a partial gas exchange in one chamber of the heart. there is a partial mixing of oxygen-rich and oxygen-poor blood. there is no mixing of oxygen-rich and oxygen-poor blood. there is a complete mixing of oxygen-rich and oxygen-poor blood.

There is no mixing of oxygen-rich and oxygen-poor blood.

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The right atrium and right ventricle of the human heart pump oxygen-poor blood to the lungs and the left atrium receives oxygen-rich blood. They never mix.

yes i have all the correct answers

1. c 6. b. 11. c

2. a 7. d. 12. d

3. c 8. b. 13. c

4. d 9. c. 14. d

5. c 10. d. 15. a

16. d. 21. a

17. d.

18. a. 22-30 you must do on

19. d. your own

20. d.

answer; the above answer to the above statement is (true)