The purpose of traffic signs, signals and pavement markings is to

What element is able to combine with itself and hydrogen to form large molecules ?

[34 points awarded to the best answer, use facts and/or data] 1.) what's the likelihood of thunderstorms occurring in the state of maryland? {this question is for a project for science, use facts and/or data and explain why . 34 points to the best answer]

They live on every continent except antarctica