animals from the most heavily populated ocean environments tend not to be preserved as fossils because

It  tends not to lock out enough oxygen to preserve organic material well.

Explanation:

Because some environments are more amenable to fossil preservation, the fossil ... For mineral shells of many marine invertebrates, "fixation" may be as simple ... this medium tends not to lock out enough oxygen to preserve organic material well.

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.