Answer:
Who keeps the ocean clean?
What's made of water but if you put it into water it will die?
What can you lose that will cause other people to lose theirs too?
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
I have memories, but none of my own. Whatever's on my inside is what is shown. If I'm ever different, it's because you changed me. I feel like a decoration, here for you to arrange me. What am I?
I flow from the Homerβs mouth when he sees doughnuts.