Tim wants to study how air currents affect weather patterns around the Earth. During his study, he makes several assumptions based on accepted scientific knowledge, including the Earth is round;
warm air rises over cooler air;
the Sun is the main source of energy for many Earth processes.
Is it acceptable for Tim to make these assumptions during his investigation?

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.