Pop is an abbreviation for "popular", this type of music has rhythmic beat, upbeat, and mainstream.
As I stated above pop has some characteristics, some things that define pop is that its music has an aim of appealing to a general audience, also its like free movement where the artist make tricks and all that stuff without formal artist characteristics.
Answer:
B. The modern tuba is bent and the Roman tuba is a straight brass tube
Explanation:
It is the reflection of how you see yourself in different stages of your life, which changes with the passing of time. Also physical changes will gradually start to appear.