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I've been argued on my colour. Without me you'll die. So many attempts... Riddle

I've been argued on my colour. Without me you'll die. So many attempts...

I've been argued on my colour. Without me you'll die. So many attempts on your life use me, so make sure you have many of my "White" friends. What am I?

Answer: Red blood cell.

#Biology #Hard #Long #What am I?
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