It is how bright is is t the observer on earth...so wuld be c!!
this any help?
It is true because scientists often do that
1, heartburn. Keep stomach acid in the stomach!
After the macrophage fails the Helper T Cell stimulates the B cells if pathogen is extracellular and Cytotoxic T Cells if the pathogen is intracellular. Once the pathogen is killed the B Cells create Memory B Cells and the Killer T Cells create memory T Cells.