Which of the following statements BEST explains how command economies have changed over time? A.
Command economies have failed immediately when attempted.
B.
Command economies have become more common since 1986.
C.
Command economies have experienced some success, but have declined economically.
D.
Command economies have completely succeeded each time they have been used.

Clara wrote the following hypothesis for an experiment about acidophilic bacteria. bacteria cells will stop dividing in a basic (alkaline) environment because of the high ph. which statement is the best way to restate the hypothesis so that it is more specific? growing acidophilic bacteria in some environments will cause the cells to stop dividing because of ph. if the ph of their environment is changed, acidophilic bacterial cell division will be affected. if the environment of acidophilic bacterial cells becomes alkaline, the bacteria will stop dividing. the more alkaline an environment, the less cell division will occur in bacteria.