The decayed remains of living organisms in soil are called (B) Humus. Humus is the organic material that forms as a result of the decomposition of plant and animal matter. It is a dark, nutrient-rich component of soil and plays a vital role in soil fertility. Humus improves soil structure, retains moisture, and provides essential nutrients for plant growth. It is a key element in sustaining healthy and productive soils in various ecosystems.

Answer: D) All of the above Explanation: A computer system consists of a computer case, a power supply unit, a motherboard, a central processing unit (CPU), main memory, and a hard disk drive. Input devices include a keyboard, mouse, microphone, video camera, and image scanner. Output devices include a monitor, speakers, and a printer.

Answer: A) LIKE operator Explanation: LIKE is a keyword that is used in the WHERE clause. Basically, LIKE allows us to do a search based operation on a pattern rather than specifying exactly what is desired (as in IN) or spell out a range (as in BETWEEN).   The syntax is as follows:SELECT "column_name"FROM "table_name"WHERE "column_name" LIKE {PATTERN}   {PATTERN} often consists of wildcards.   In SQL, there are two wildcards: % (percent sign) represents zero, one, or more characters. _ (underscore) represents exactly one character.   More :: Certification Questions on SQL

Answer: C) Ctrl + Z Explanation: For undo the action or last action [Ctrl + Z] is used.