You are presented with the question "Mercury cannot sustain life because it is" and the following answer choices: 
- too close to the Sun
 - harmful substances
 - dormant state
 - major threat to health
 - too cold
 - has little gravity
 - scarce resources
 - too small

Now knowing that if a planet becomes too hot then that planet cannot sustain life and mercury is close to the Sun, and is extremely hot, choose the best answer.


 

 too close to the Sun        