What is a subspecies?

A subspecies is a taxonomy category that ranks below species, usually permanent geographical isolated race.   

We can use solar powered cars or ride bikes instead of cars that burn fossil fuels

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.