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The human heart is an organ that is made up of cells. Not all of the cells that make up the heart are identical, however. What name is given to a group of similar cells that perform a special function and together make up an organ?
A) embryo
B) organelle
C) system
D) tissue

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MYNAMEISMINHO
I'm gonna say tissue 
D tissue, A group of atoms create a molecule, a group of molecules creates cells, cells create tissues, and so on.

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