Fact 1: Some insects can use their antennae to detect sound.

Fact 2: Sounds are caused by vibrational energy.

Given the two facts above, answer the question "Some insects can use their antennae to detect" with the following options: 
- chemicals
 - scattered light
 - an area swollen with pus
 - bending light rays
 - vibrational energy
 - heat or cold
 - cloudy and rainy weather
 - that material's properties


 

     vibrational energy    