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?
There's a one-story house in which everything is green. Green walls green windows green doors. What color are the stairs?
I am the kind of food monkey likes and people slip on me and fall in cartoons.
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
I am a sound made by felines when petted.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?