I think the answer is evolution.
The answer is B. Flying and keeping warm
Answer:
Development of testable hypothesis from observation
According to one theory “listening to Mozart music induce short improvement in certain kinds of cognitive task”. Study have shown a proposed link in improving the reasoning and visualization of students during examination in the presence of classical music. It means there is relationship between classical music and man hormonal system. Therefore, listening to classical music raise dopamine and treating depression level. It leads to better performance in examination.
Silveraja et al. (2015) studied the effect of classical music on examination performance while students solving their papers in examination hall. He concluded that in the presence of music the performance was better.
Skeletal, respiratory, muscular, nervous, and circulatory
