Answer:
barcode reader is the correct answer
Common input devices include the keyboard, image scanner, and integrated video cameras. These also include the microphone, mouse, joystick controller, gamepad or joypad, webcam, digital pen, and others. Input devices are computer hardware used to control signals and provide data to a computer or an information appliance.
The answer is If a skin or blood TB test is posittive, your doctore mau give you a chest X-ray. They will look for abnormal spots on your lungs or any changes caused by TB.
Opacity is the extent to which something blocks light. You can change the opacity of layers, filters, and effects so that more (or less) of the underlying image shows through.
