Answer:
1.similarity:
- they are both editing keys
3.ergonomics are designed keying devices that alleviates wrist strain experienced when using ordinary keyboard for long hours
4.
- .a click is pressing and releasing the left mouse button once
- right click is pressing the right mouse button once to display a short cut menu with commands from which a user can make a selection
- double click is pressing the left button twice in rapid succession
- drag and drop is where by the user drags an icon or item from one location on the screen to another.