Most reptiles have good eyesight and a keen sense of smell, and if someone has bad eyesight,the sense of smell is heightened. Given these facts, if most reptiles have bad eyesight, the ability to smell is what among the following options:
- dangerous
 - lowered
 - improve
 - positive
 - smelled
 - decreased
 - heightened
 - critical organs


 

       heightened  