What do you think is a challenge for cliff swallows living in this new environment that would explain an increase in the number of swallow roadkill seen in the 1970s, after the highway was completed?

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.