Yes, Snakes do have back bones.
If it gives live birthall mammals give their babies milkall mammels are warm bloodedthey all have fir or hairthey all have a spinethey all have lungs to breathe airsome mammeals... dolphin, whale, dog, cat, zebra, mouse, rhino, polar bear, wolf ETCHope I have Helped ")
Snakes are vertebrates an breath in essentially the same way we do, except most species only have one working lung, and additionally use part of the trachea as supplemental lungs. They breath in and out the the nose. While swallowing snakes breath through a tube in the mouth under the tongue.