The device is ; a modem.
Hope this helps
Well we just benefit from it like it just helps as I guess
I would say A. Test it and receive feedback
The difference between a calculator and a computer is that when a calculator performs computations it is slower but needs more human assistance - C.
While a computer on the other hand, computes tens of thousands of computations without any human input, all done automatically.
The answer is D. cortisol level would most likely decrease.