Answer:
I fill a room but take no space. What am I?
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
I am heavy forward, but backward I'm not. What am I?
What gets bigger when more is taken away?
I am a creature with a βtightβ name.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.