The answer is d. flour and water because a mixture of flour and water is not going to be even throughout, it will be lumpy and not completely mixed.
Enzymes. There are 3 main types: Peptidase, Lipase, and amylase :) hope that helps! I'm learning that stuff too :)
Oceanic crust is thinner and denser than continental crust.
A sudden shift in the tectonic plates of the earth
C)Bones Surround And Protect The Lungs