b) some bacteria reduce nitrate ion
Answer:
Dorsal lol, its contracts and pumps blood to the aortic arches.
Answer:
THE TWO WAYS A VIRUS CAN KILL A CELL ARE CELL LYSIS , ALTERATIONS TO THE CELL'S SURFACE MEMBRANE AND VARIOUS MODES OF PROGRAMMED CELL DEATH.
Vestigal organs are organs that, as we evolve, the organs loose their purpose and have no function anymore. The appendix is a vestigal organ
Hope this helps
