31. Unfortunately, even nontoxic blooms can kill marine animals by depleting oxygen in the water. 32. Divers use the speargun for defense against dangerous marine animals . 33. Marine animals can be affected by sudden changes in the salinity of ocean water.34. Olson liked the idea and suggested Hillenburg to create a series of marine animals . 35. Marine animals decorated friezes around the base of the tholos.36. Marine animals of the islands include dugongs ( an endangered species of flatback sea turtles.37. But insects and marine animals , although they're tiny, make incredible materials that we could use. 38. It was the intention of this benefactor to study the natural history of marine animals . 39. This venomous, marine animal poses a threat to swimmers. 40. The society protects marine animals and it deals with them in case of spilled oil.