His mother could encourage him to wear sunblock and sunglasses.
Answer:
here is answer
Explanation:
Thus, gases (such as O2 and CO2), hydrophobic molecules (such as benzene), and small polar but uncharged molecules (such as H2O and ethanol) are able to diffuse across the plasma membrane. Other biological molecules, however, are unable to dissolve in the hydrophobic interior of the phospholipid bilayer.
I'd say 13-14 years of age... usually when kids are starting high school
