Some insects can use their antennae to detect sound, and sound waves are compressional waves. Given these facts, what do some insects use their antennae to detect among the following options:
- members of their own species
 - spiders
 - heat and light
 - an area swollen with pus
 - compressional waves
 - density
 - h2o
 - electromagnetic energy


 

     compressional waves    