It has two phosppholipid layers that are either hydrophobic and hydrophillic the function is to protect thing from coming in and out
Because mostly some microorganism may be very small and harmful that can affect humans or animals just by the experience of the microorganism.
Sour receptors occur primarily along the sides of the tongue and are stimulated mainly by acids. Salt receptors are most common in the tip and upper front portion of the tongue. They are stimulated mainly by inorganic salts. Bitter receptors are located toward the back of the tongue
hopefully this helps but i could be really wrong lol
B) They should test their hypothesis before coming to that conclusion.
