<span>B. wherever mechanical digestion occurs, chemical digestion also occurs</span>
Melatonin (<span>also known as N-acetyl-5-methoxy tryptamine)</span>
The part of the phospholipid bilayer that interacts with water would be the hydrophilic portion consisting of the polar phosphate group. The hydrophobic tails which are the fatty acid chains will not interact with the water present in the aqueous environment.
