45. Two or more different atoms are combined in a definite whole number ratio to form an?

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.

Atissue is a group of connected cells that have a similar function within an organism.