Julian is late to class and sees a list on the board:

-are explanations of observations and hypotheses
-are based on many experiments
-have been revised over time
-can be used to predict what may be expected in the future

what is julian’s class discussing?

scientific inquiries
theories
scientific questions
laws

The correct is option theories.

The theories are the explanation of the phenomenon or the hypothesis. The theory explains cause and the working of  nay phenomenon. The theories are established on the basis of the experiments, which reproducible and replicatable. according to the advancements and new discoveries, the theories can change over time, once, the theory is established it can help to  predict the outcomes of the futures.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.