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
