How can dna be used to solve a crime

The major use of DNA is not to solve a crime necessarily but to prevent an injustice. If something so tiny as a hair is left on the crime scene it could be enough to prove that someone is innocent even though all other pieces of evidence point to the guilt of the accused.

If that hair has a different DNA than the accused, there might be enough doubt to free a person who is actually innocent.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.