In which direction does heat flow?
cold to cold
cold to hot
hot to cold
hot to hot

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

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Why does asexual reproduction result in offspring with identicle genetic variation