Answer:
I am the only thing that place today before yesterday. (one word)
Part carbon, part water, I am poison to the fishes. Many falsely claim my name, I am the pause that refreshes. What am I?
I am round as an apple, deep as a cup. All the King's horses can't pull me up. What am I?
The more of me you take, the more I appear behind you. What am I?
rub me and a genie might appear
The answer I give is yes, but what I mean is no. What was the question?