Most of the nitrogen gas in earth's atmosphere comes from

a. fires

b. erosion

c. bacteria

d. the breakdown of carbon dioxide

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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