Are humans composed of cells?

Are humans composed of cells?
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yes, it is estimated the human body has 37.2 trillion cells.
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What is true about ribosomes ? (1) These are self - splicing introns of some RNAs (2) The prokaryotic ribosomes are 80S, where “S” stands for sedimentation coefficient (3) These are composed of ribonucleic acid and proteins (4) These are found only in eukaryotic cells

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