Longitudinal waves are made up of areas of more dense particles or less dense particles. The less dense particles are called ___. a. crest
b. compressions
c. wavelengths
d. rarefactions

Letter a i’d go with

Ithink they do have the same properties just in less quantities i think

The purpose of a lab is to do your "expirements" the importance of the topic is so you can now what the story is about and the last one is because no one is me with my question ( what is 3 over 4 x - 9 = 27 maybe you can )