Hey, I really need help. I am sad all the time and don't know why. I stay up till midnight everynight until I cry myself to sleep. My life is great! And I do so much fun stuff with my family, but in the end, I always end up sad again. Can I please get some help? Why do I feel this way?

Which statement best illustrates that problem solving can create new medical devices? robert hooke was in charge of verifying the information that was sent to the royal academy. william harvey did experiments with apes to learn about the circulatory system. the stethoscope was invented because the physician did not want to put his head on women's chests to listen to their heart and lungs. anton van leeuwenhoek was a very curious man and looked at just about everything under this microscope.