PLS HELP ASAP. list 5 chemicals that contribute to ozone layer depletion?​

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

Which activity describes an application of topographic maps? check all that apply. recreation, such as camping and hiking engineering, such as the construction of roads and buildings science, such as mapping stars in the sky business, such as analyzing population centers science, such as analyzing surface features

Chris is about to do an experiment to measure the density of water at several temperatures. his teacher has him prepare and sign a safety contract before beginning the experiment. which term is mostlikely part of the safety contract