Answer:
I think it is a because the oldest things would be farther down in the ground and the youngest would be upper to the ground if that makes sense
First, the yellow fever virus is phagocytosed by white blood cells. The phagocytosed white blood cell then travel through the lymph vessel. Since lymph node contain white blood and filter lymph, the yellow fever phagocytosed with white blood cell establish in the lymph node.
Not sure my dude. My guess would have to be A
Answer:
A. Increasing the food supply
