If a planet becomes too hot then that planet cannot sustain life, and venus is thought to be hot because of the runaway greenhouse effect. Given these facts, the runaway greenhouse effect present on Venus makes what unlikely among the following options:
- carbon in the atmosphere
 - bloom time
 - Animal survival
 - robotic landers
 - sustainable life
 - Plant reproduction
 - population movement
 - sunlight at the surface


 

     sustainable life    