Why is research and development an integral part of the designing and producing process of an aerospace product?

The reason why research and development is an integral part of the designing and producing process of an aerospace product is that the aerospace industry is constantly pushing the limits of technology. Hope this answers your question.

During exercise, blood pressure, pulse and respiration increase to meet the increased demand for oxygen and nutrients by your musculoskeletal system. The adjustment of vital signs to match your body's level of physical activity is an example of homeostasis in action.