How can an experiment that disproves a hypothesis (or a wrong hypothesis) be useful?

Blank is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer

Which of the following insects is a decomposer? a. mosquito. b. caterpillar. c. beetle. d. none of the above.

Which of the following events did not occur as a result of china’s open-door policy? a. trade between japan and china was encouraged. b. all countries were given equal access to chinese ports. c. foreign influence in china increased. d. the influence of the communist party weakened.