Why might every person be called a chemist?

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.

If forces acting on an object are unbalanced. true or false

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader