Ahockey puck slides across an ice rink more easily than it does across a rough concrete surface. why is this?

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

Long term exposure to waves can cause sunburns and skin cancer.

When a gasoline engine burns gasoline, what type of chemical reaction is occurring?