How do scientists monitor populations for signs of pollution and why is this important?

I need help

they monitor it through a modern system machine, it's important because we need to know the population we have.

Explanation: which means are we increasing it reducing in our population

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; i believe the answer is (polygenic inheritance;