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These are characters of a living being:
  - can grow
 - needs food
 - can respond to stimuli
 - can reproduce
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Both molecular and cellular organization.Living things must be able to organize simple substances into complex ones.Living things organize cells at several levels: 
Tissue - a group of cells that perform a common function.Organ - a group of tissues that perform a common function.Organ system - a group of organs that perform a common function.Organism - any complete living thing. 
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