Theme to what? I'd gladly help you if you gave me more information
It is a compound noun. Why? Because 'Back''Pack' is one word, but if you see how i structured it, it can be two. Back, as in your body part, and Pack as in a bag or container, you name it. And just a tip, compound means two words squished into one, ex. CupCake, FireWorks, BaseBall, BasketBall. But when you are typing it, of course, you wouldn't capitalize the first letter of the two words :)
A.) <span>It allows the speaker to set up the contrast to his or her own views.
Hope this helps!</span>
you are getting you education dinner than later. And you can get to work and make money faster than people that push off college