To identify features that apply to both viruses from the provided list, we can analyze each option in relation to viruses:
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Prevent with vaccines: This applies to some viruses, but not all. However, it is a characteristic of viruses in general.
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Contains Proteins: Viruses contain proteins; they have a protein coat called a capsid.
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Contains Ribosomes: Viruses do not contain ribosomes; they rely on the host's ribosomes for protein synthesis.
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Lipid Envelope: Some viruses have a lipid envelope (e.g., HIV, influenza), but not all viruses do.
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Contains Lipids: Only some viruses have lipids (those with a lipid envelope).
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Cannot reproduce on its own: This is true for all viruses; they cannot replicate independently and must infect a host cell to reproduce.
Based on this analysis, the characteristics that apply to both viruses from the list are:
- Contains Proteins
- Cannot reproduce on its own
If you need to select just one that applies to all viruses, then Cannot reproduce on its own is the most definitive choice.