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PLEASE HELP!!!! 12 POINTS!!!! :)

Before cyanobacteria appeared, Earth’s atmosphere was composed of water vapor, carbon dioxide, nitrogen and other gases. Where did these gases come from?


A. They were released by the atmosphere.

B. They were released by the biosphere.

C. They were released by the geosphere.

D. They were released by the hydrosphere.


Please explain your answer! :)

Respuesta :

I think its C) Released by the Geo-sphere because volcanos give off the same exact gases and have been around long enough to give off enough gas to create an atmosphere.

your answer is c)They were released by the geosphere.

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