The correct answer will be- yes, the hypothesis could be proposed and experiments can be performed.
Explanation:
A scientific method is a systematic approach to answer and explain the natural phenomenon occurring in the surrounding. It involves observing the phenomenon, asking the question based on which predictions could be suggested in the form of hypothesis which could be tested through experiments.
In the given question, the researcher observes that pea plants grow faster than corn plants which could be answered and explained by proposing a hypothesis based on the previous research. The scientific experiments could be performed in the field by measuring the height of the plant as a variable to be studied.
Looking at the options, the correct one is Brainstem because it is the only one that deals with breathing, heart rate and blood pressure which definitely is linked to autonomic nervous system activity during sleep and the memory consolidation.