How would you describe the movement of water into and out of the cell?
a) with energy, through a protein channel
b) with energy, through the bi-lipid layer
c) without energy, through a protein channel
d) without energy, through the bi-lipid layer

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.