Which best compares scissors and a seesaw

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.