What are two reasons why arriving above ground all at once increases the cicadas' chances of surviving and reproducing?

What’s the scientific notation for the number 6,840,000,000

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

How does science use models to gain a better understanding of concepts?