Which of the following statements are true of nuclear energy and reactors? A. A nuclear reactor uses controlled fission reactions. B. nuclear reactors use uncontrolled reactions. C. nuclear fission reactions use only a small amount of material to produce a large amount of energy. D. Two tons of starting material are required for nuclear fusion

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.