hydrophilic vs hydrophobic parts of lipid bilayer & why the location of each makes sense NEED HELP ASAP

In a lipid bilayer, the hydrophilic part is the head, and the hydrophobic is the tail. This location makes sense because the plasma membrane has a barrier that has a selective permeability so it selects what goes in and what goes out of the lipid bilayer.

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.