Give a situation that could produce ultraviolet radiation. Use the notation "x to y" where x and y are numbers from levels n = x to n = y...do not include the quotes in your answer.

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

Drug abuse will not lead to physical and psychological dependence. true or false ?

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering