Which factor does not affect the amount of water that can be stored in the ground? a) fractures in the rocks b) pores spaces in the rocks c) the existence of caverns d) elevation of sea level

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.