Fact 1: Most salamanders use their sense of smell to find a mate.

Fact 2: To couple in sexual union, to be matched or mated.

Given the two facts above, answer the question "How do salamanders usually find sexual partners?" with the following options: 
- mouth of rivers
 - It helps them survive
 - interact
 - it needs them
 - competition
 - movement
 - sense of smell
 - heat produced


 

       sense of smell  