Who is trying to be friends with me lol btw I'm not 23. And does anyone know how to change your age on here?

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

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum