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Explanation:
1 the row on a typewriter or computer keyboard that contains the keys (home keys) to which four fingers of each hand return as a base, on a QWERTY keyboard being A, S, D, and F for the left hand and J, K, L, and the semicolon for the right.
3 pointing device is a type of input devices that allows a user to interact with a computer by moving a cursor on a monitor to select icons and trigger desired actions. The de facto pointing device for desktop computers is a mouse, which was invented by Douglas England in 1967
4mouse that uses light to detect movement. Introduced in the late 1990s, optical mice superseded mechanical mice because their sealed bottom surfaces do not absorb dust and dirt. They work by emitting light from an LED or laser, and a CMOS sensor detects the light reflections as the mouse is moved
2when sitting in front of a computer for long periods of time, right posture helps in keeping the spine stress free and prevents muscular pain and backache. Apart from contributing to better appearance, good posture helps in keeping muscle fatigue at bay, allowing the body to use less energy.
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