Which area of the leaf is most responsible for protecting the leaf from the drying effects of the air?

The cuticle would be the part of the leaf that is primarily responsible for safeguarding the leaf structure against the negative effects caused by the dryness of air. In addition, the protective film is usually made up of hydrocarbons in which among its main function is to regulate the presence of water in the leaf structure.

Some of her  assignments would be creation of drugs. she is a medical chemist after all so she'd need to have the necessary knowledge to make medicine which can later be sold in a pharmacy