How will you explain to a preschooler on how the universe started?

With difficulty.

Explanation:

Once upon the time, everything was in a tiny spot. Then, that tiny spot decided it was tired of being tiny. It started growing, and growing, and growing. There was lots of hot gas, which became our sun eventually. The suns made some planets to keep them company, and everything's just like now.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

plant because they survive by water, sunlight, ex.

explanation: