Questions

An Element is a pure substance of one type of atom. In chemistry, any material such as carbon, hydrogen, iron, or oxygen that cannot be broken down into more fundamental substances is nothing but an element.

The following are the factors to be considered before deciding the target audience for any advertisements:

•       Age


•       Working class (professionals)


•       Non working class (Retired/Home makers)


•       Socio economic status


•       Region specific


•       Religion/community etc. 

Primary key helps us to identify a row uniquely in a relation

The first of the four stages of coal formation is lignite coal.

There are four stages of coal formation:

1. Peat,

2. Lignite,

3. Bituminous and

4. Anthracite.

The bacteria has removed a large portion of the other constituents of the plant matter and left around 25 to 34 percent.