Answer:
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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Answer:
What is this picture supposed to mean? What do we do with this? How do we solve this for you?
Death because it decreases the population