People can do two unrelated tasks at the same time just as easily as doing one

According to the authors, what originally spurred the development of advertising for cigarettes and other products?

a. the development of the ability to mass-produce products b. the development of new forms of media c. the growing desire of the public for information about the product d. the development of the entertainment industry

Maternal ________ during pregnancy may feminize and demasculinize male rat progeny because of a delay in the androgen surge needed for proper sexual development

Fill in the blank(s) with the appropriate word(s).