Fact 1: Most reptiles have good eyesight and a keen sense of smell.

Fact 2: If someone has bad eyesight,the sense of smell is heightened.

Given the two facts above, answer the question "If most reptiles have bad eyesight, the ability to smell is what?" with the following options: 
- dangerous
 - lowered
 - improve
 - positive
 - smelled
 - decreased
 - heightened
 - critical organs


 

       heightened  