Black holes are
a. new stars
b. young stars
c. medium-aged stars
d. old stars

Black holes are new stars because the black hole is created when a old star dies so it creates a new star. hope this helps.

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.

Scans the skeleton into a facial reconstruction software.