What does the term Homo sapiens mean?

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

How do disease caused by bacteria and disease caused by viruses react to antibiotics