All living organisms share eight characteristics that distinguish them from nonliving things:
1. Composed of cells; the smallest unit of life.
2. Organization; use smaller structures to build larger ones.
3. Response to environmental stimuli.
4. Homeostasis; stabilize suitable living conditions.
Which of the following is not a necessary component of life?
a) needs energy
b) uses DNA for heredity
c) breathes oxygen
e) depends on other living forms
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