Viruses differ from bacterial cells in that all viruses

Viruses have to invade the body of a host organism in order to replicate their particles. Therefore, most viruses are pathogenic. The main difference between bacteria and virus is that bacteria are living cells, reproducing independently and viruses are nonliving particles, requiring a host cell for their replication.

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Explanation:

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.