Answer:
Some will use me, others not. Some have remembered, others forgot. For profit or gain, I'm used expertly. I can't be picked off the ground or tossed into the sea. What am I?
What belongs to you but others use it more than you do?
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
I row quickly with four oars, but never come out from under my own roof. What am I?
small land in water.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?