Extinction _____. only happens above the species level cannot happen to more than one species at a time has happened to over 99% of species that ever lived on earth happens when a species or population dies out.
Nivolumab, marketed as Opdivo, is a medication used to treat cancer.
6 Reviews. 6 Reviews. Macrobid is the brand name for nitrofurantoin, an antibiotic used to treat or prevent urinary tract infections. Macrobid works by killing the bacteria that cause the infection or by preventing the bacteria from growing.acrobid is the brand name for nitrofurantoin, an antibiotic used to treat or prevent urinary tract infections.