Which of the following was most likely responsible for the fact that organic molecules no longer form spontaneously on Earth?

The amount of UV radiation increased.

The amount of oxygen in the atmosphere increased.

Water accumulated in the oceans.

Earth's surface temperature warmed.

Question

Which of the following was most likely responsible for the fact that organic molecules no longer form spontaneously on Earth? 

 The amount of UV radiation increased. 

 The amount of oxygen in the atmosphere increased. 

 Water accumulated in the oceans. 

 Earth's surface temperature warmed.

secret-ninja · Answer

I am guessing B. I found it on this page: http://openstudy.com/study#/updates/52602edce4b0c78c62ea90d5

anonymous · Answer

Thank you, that was my guess. :)