B.5(D)

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Across
  1. 2. Organisms that can function and reproduce on their own, unlike viruses
  2. 5. The part of a cell that produces energy- something viruses lack
Down
  1. 1. A virus is considered this because it cannot perform life processes on its own
  2. 2. Protective outer layer of a virus
  3. 3. The protein structre that allows viruses to attach to host cells
  4. 4. The type of cell a virus must infect to replicate