How do the average temperature and the seasonal changes at the equator differ from those at the poles?

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.

In a load, the load is paralel to the shaft. n a. angular n b. thrust n c radial n d. none of the above

With i really need the correct answer!