You are presented with the question "what do some insects use their antennae to detect?" and the following answer choices: 
- members of their own species
 - spiders
 - heat and light
 - an area swollen with pus
 - compressional waves
 - density
 - h2o
 - electromagnetic energy

Now knowing that some insects can use their antennae to detect sound and sound waves are compressional waves, choose the best answer.


 

     compressional waves    