Innate immunity and acquired immunity are both . a. dependent on surface secretions from sebaceous and sweat glands, which give the skin an acidic pH that is unfavorable for bacterial colonization b. characteristics of all vertebrate animals c. based on the trapping of microbes by mucus d. dependent on tears, saliva, and mucous secretions that contain lysozyme, an enzyme that digests bacterial cell walls e. dependent exclusively on cell-mediated responses