The answer should be vulture
19. B - mitochondria
20. D - vegetative structure
21. C - inducing a mutation
22. A - phosphates
23. C - fungi
24. A - provides support
25. C - sponges
26. B - opposite charges
27. D - asexual reproduction
28. not sure about this one sorry
29. D - all of the above
30. A - prevents ions and large molecules from passing through the membrane
The answer to your question is B.Chromatin
The control group outs the one that you don't change. The reason you don't change it is because you use it as a comparison with the other groups.