Should I break, you may be harmed, or else set free - It all depends on where we're found; I in you, or you in me? What am I?

Answer: a cell

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More What am I ?

Sing me to a baby about to go to sleep. What am I?
Skirts for men. What am I?
Soft, hairy, from door to door. I am the pet that always stays on the floor. What am I?
Soldiers line up, spaced with pride, Two long rows lined side by side, One sole unit can decide, If the rows will unite or divide. What am I?
Some people avoid me, some people count me, some people just consume me. What am I?
Some people believe in me and others don’t at night I roam around and sometimes I float. If you hear a troubled noise coming from the ground go run and hide from my creepy sound. What am I?
Sometimes dark and sometimes bright, I make my way among twinkling lights. Seas and oceans obey my call, yet mountains I cannot move at all. My face is marred and gray, but I’m majestic anyway. What am I?
Sometimes I am light, sometimes I am dark. Most people like me. What am I?
Sometimes I am light, sometimes I am dark. What am I?
Sometimes I am liked, sometimes I am hated. Usually I am old, usually I am dated. What am I?
Sometimes I fly as fast as the speed of light. Sometime I crawl as slow as a snail. Unknown until I am measured but you will certainly miss me when I’m gone. What am I?
Sometimes I shine, sometimes I’m dull, sometimes I am big, and sometimes I am small. I can be pointy, I can be curved, and don’t ask me questions because even though I’m sharp, I’m not smart enough to answer you. What am I?