Questions

It is an investment strategy that involves the buying of money market instruments or currencies in anticipation of a price rise or a future increase in demand. Buying forward allows an investor to take advantage of future and potential profits by buying now at alower price, and selling when prices rise.

An index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval. Index can be created on one or more columns of a table.

I am black gold i.e charcoal. It is black when it is not used and when using it is red due to fire and when used it is in grey color as it becomes ash. 

The particles which makes upon an atom are called subatomic particles. Electrons, protons and Neutrons that makes an atom are called subatomic particles.

Whereas,

An ion is an atom or group of atoms in which the number of electrons is different from the number of protons.

Nucleic acids are polymers of individual nucleotide monomers.

Each nucleotide is composed of three parts:

a 5-carbon sugar,

a phosphate group, and

a nitrogenous base.

Special Friend - Stone.

Example ::

He is my special friend - He is my stone.