1. the original source of energy for most ecosystems is the

Sun

Explanation:

Without the sun the Earth would be mildly cold, too cold for rehabilitating. All the soil would be frozen, the plans would shrivel and die, and if humans and animals don't die from cold, they'll die from lack of food.

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.

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ahem

what the squwock

explanation: