Kwalliya ko kuma Ado duk da cewa dai suna da bambanci, ita kwalliya mata keyi shi kuma ado maza keyi, misali zakaji ance ta chaba kwalliya ko kuma ya chaba
Tarin abubuwan tarihi na al'adu sun ƙunshi abubuwa da yawa da aka sani suna da haɗari ga muhalli da lafiyar ɗan adam. Wasu abubuwa masu haɗari na iya zama
fertigation da chemigation (aikace-aikacen magungunan ƙwayoyin cuta da sauran sunadarai don tsaftace tsarin lokaci-lokaci, kamar chlorine ko sulfuric acid) suna
lantarki. Ana amfani da kwayoyin halitta don abubuwan da za'a iya zubar dasu, kamar marufi, kayan kwalliya, tukwane, kwano, da kara. Biopolymers suna samuwa