Scientists conduct scientific investigations for which of the following reasons? i. to discover new things about the natural world ii. to explain observed phenomena iii. to test the conclusions found in previous research iv. to test the predictions of current theories

The answer is I, II, III and IV.  Scientific investigation is the way in which scientists and researchers use a systematic approach to answer questions about the world around us. They may want to explore new ideas, gather evidence or prove or disprove previous results.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation: