Recent discoveries by the Kepler Space Telescope have significantly expanded our knowledge of exoplanets. Which excerpt BEST supports the main idea above?

2cool and cold temperature unless its an ever green tree 

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion

Had a democratic form of government

Ibelieve the answer would be a large-scale natural disaster