Atornado uproots trees and plants. which earth systems interact during this process?

a. soil and hydrosphere
b. hydrosphere and biosphere
c. atmosphere and biosphere
d. hydrosphere and atmosphere

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.

Cathy hypothesized that corn would not grow in mud. to test this hypothesis, she took corn kernels and placed 5 in mud, 3 in soil, and 2 in water. to her surprise, the kernels in the mud grew faster than the kernels in the soil. what error might have caused these unexpected results? a. wrong hypothesis b. not enough variables c. undefined control d. too many variables

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?