Answer:
I have a ring but no fingers. I used to stay still all the time but nowadays I follow you around.
I have roots nobody sees. I am taller than trees. Up, up I go but I never grow. What am I?
I cause involuntary movements in your vehicle
I am in the middle of water but am not an island.
I am a ship that can be made to ride the greatest waves. I am not built by objects but built by minds.
Give it food and it will live, give it water and it will die.