HELP! Which of the following would help clouds form?

a. Air flows down the eastern slope of the Rockies near Browning.

b. Air on a barren mountain slope gets hot and begins to rise.

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

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.