Which element is this how do you know

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

If steel is more dense that lake water, why can a boat float