Viruses do not have a nucleus, they cannot be recycled because they release their genetic code and that cannot be recovered unless they replicate and the problem with letting them replicate is that they have a likelihood of mutating and becoming something malicious. So by the power of deduction the correct answer is 3
An example would be plants, because they produce their own FOOD. And don't need someone feeding it. This is called photosynthesis
Answer:
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