Explain why reactivity increases by linking increase in atomic number, number of shells with the shielding of outer most electron

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

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