How many types can viruses infect?
mice pigs bird RNA ova tiny HPV Two
A B C D E F G H
Bacteria are normally classified as either 'good' bacteria or 'bad' bacteria.
Viruses can infect good and bad types.
How many types can viruses infect? (A) mice (B) pigs (C) bird (D) RNA (E) ova (F) tiny (G) HPV (H) Two