Explanation

OSI: describes seven layers that computer systems use to communicate over a network.

Explanation

Ctrl+H is used to find and replace text in a file.

Explanation

Computer RAM is essentially short term memory where data is stored as the processor needs it.

RAM: Random Access Memory

Explanation

 A computer system consists of a computer case, a power supply unit, a motherboard, a CPU, main memory, and a hard disk drive. Input devices include a keyboard, mouse, microphone, video camera, and image scanner.

CPU: Central Processing Unit

Explanation

Table in database must have a primary key.

Explanation

To removes a sheet from workbook select the sheet, then choose Edit > Delete Sheet these options available in excel 2003 and earlier version.