Which of the following are true of ozone in the atmosphere? Choose all that apply. A. It is like the Earth’s sunblock. It provides a layer in the atmosphere that absorbs most of the harmful UV radiation that comes from the Sun, which allowed living organisms to colonize the land surfaces of the Earth. B. It is made of two oxygen atoms bonded together (O2). C. It is used by living organisms for respiration, the process in which food is broken down to release the energy that living things need to perform all bodily functions. D. It is made of three oxygen atoms bonded together (O3).