Which of the following is an example of homeostasis? a food being digested in the stomach b the lungs expanding during inhalation c the body being warmed by shivering d the leg muscles contracting during walking

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%

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.