Answers

2015-06-11T16:48:12+08:00
The body⇒different systems(digestive system,respiratory system,etc.)⇒organs(heart,lungs,etc.)⇒atoms(are particles that made out organs
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2015-06-14T21:54:39+08:00
The body is composed of different systems which are collections of cells, tissues, and organs.
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