A roller coaster uses the track in this picture. Where will the roller coaster have the most kinetic energy?
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Why should the united state be concerned about air pollution in china?

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

Cells destroy body cells infected by a virus or bacteria.