False. sea otters dont really eat <span>sea urchins and not much would chang</span>
<span>Answer: occurs when the aortic and pulmonary valves backfill with blood</span>
The second heart sound,that is heard in normal hearts, is generated by the closing of the semilunar valves((the aortic valve and pulmonary valve). Before that, the first sound corresponds to the closing of the atrioventricular valves.
The answer would be D. hormones, because that is the only thing not studied during cognitive psychology, which is the study of your brain and how it perceives things, how good your memory is, and how your language is
