Which of the following is the best definition of a hypothesis?

a. an explanation of natural events that is well supported by scientific evidence
b. a set of rules for ethical conduct during an experiment
c. a statement that describes how natural events happen
d. a possible answer to a scientific question

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:

trachea, alveoli, lung capillaries, arteries