4.5 x 1016 molecules of carbon dioxide are equal to how many moles? show work pls

An object becomes electrically charged when: electrons are created in it electrons from it are destroyed electrons are transferred to it protons from it are destroyed protons are created in it

What metric units would you use to measure the thickness of a key

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.