How do bottlenose dolphins move through the water?

bottle nose dolphins move by flexing their tails up and down and if they wriggle like a snake they will die and will not be able to survive and also if they are in the ocen alone they will also die.there are all different kinds of dolphins and they need a pod in the ocen .i have been studing dolphins for a while and i learned a lot and my favourite kind of dolphin is a bottle nose dolphin.i also like killer whales i injoyed typeing this little peice about dolphins and whales thank you for offering me to write this.