Compared to bacteria cells, viruses are

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.

hope this helps :)

i'd say that the moon rock is about 2.2 billion years old.

the answer is: metamorphic rocks often show the presence of fossils, also a

hope i

-lavira: )