The evolution of the tetrapods-four-legged vertebrates occurred in which of the following this geological time periods?

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.

Explain what happens at the saturation point when adding salt to water at room temperature.

A36,287 kg truck has a momentum of 907,175 kg • . what is the truck’s velocity