Robert decided to go for a run when he gets home from schooll. As he begins running, his breathing rate starts to increase. what are the mechanisms that cause his breathing rate to increase.

Pepsin is an enzyme in the stomach that breaks polypeptides into amino acids. pepsin functions best at a ph of around 1.5. what would be the most likely result if the ph of the stomach were increased to 5

According to the cladogram, which organisms have roundworms as a common ancestor?

Wich organism obtains its energy from dead or decaying matter