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2 answers

1. the fact that they all need "food" or an energy source to survive
2. eventually they all use the suns energy

3. they all produce by-products

2006-06-12 22:58:10 · answer #1 · answered by muj 2 · 0 0

breathing?

2006-06-06 23:12:18 · answer #2 · answered by hatingmsn 6 · 0 0

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