This image of a baby was produced using ultrasound. Which option is the best model of how the image was made?
O An X-Ray
O An echo
O A convex lens
O A turbine

Which of the following is an example of how telecommunication devices people do their jobs? a.) a security guard checks the time using a digital watch. b.) a banker does some quick math using a solar calculator. c.) a nurse uses a digital thermometer to take a patient’s temperature. d.) a construction worker reports in to his office using a cell phone.