A promise. 

The Promise made to somebody by you can be break but you cannot touch it.

DPI [Dots Per Inch] is a measurement of output quality of printer resolution. It represents number of ink dots the printer can place in an area of one square inch. The lesser the DPI the less sharper the image and vice versa.

Therefore, a printer that may have 400 DPI, a printer that can print 400 x 400 per square inch or 1,60,000 dots per inch.

Here all the options given are important functions of Earth's atmosphere.

Duplicating the content or Copying words or ideas from someone else WITHOUT giving credit is called Plagiarism.

Plagiarism can be a violation of copyright laws and can be considered cheating.

Types of Plagiarism :: 

1. Direct Plagiarism

2. Mosaic Plagiarism

NH3, Ammonia is a neutral compound as the individual oxidation numbers elements that make up the compound NH3 are Nitrogen (N) and Hydrogen (H) sum to zero. 

We do not speak of the oxidation number of a molecule. We can speak of the oxidation numbers of the individual elements that make up the compound.

Here the oxidation number of Nirogen is -3 and that of Hydrogen is +1.

Now, NH3 = 1(-3) + 3(+1) = -3 + 3 = 0.

The Constitution lists 27 expressed powers of Congress. It include power to declare war, levy taxes, regulate commerce and currency.

Congress's other expressed powers are wide-ranging, including:

The power to establish rules to allow foreign-born immigrants to become citizens of the United States

The power to make rules for bankruptcies

The power to punish counterfeiters

The power to set up a national post office

The power to provide for copyrights and patents to protect the work of inventors and artists

The power to organize all federal courts below the Supreme Court

The power to punish pirates

The power to hire pirates to attack foreign enemies

The power to make rules to regulate the conduct of the armed forces

The power to call out the militia to defend the country from invasions or insurrections

The power to organize and discipline the militiary

The power to govern the federal capital (Washington, DC)

The power to acquire lands from the states for use by the federal government

The power to make all Laws which shall be necessary and proper for carrying into Execution the foregoing powers.

Gene is a hereditary unit consisting of a sequence of DNA that occupies a specific location on a chromosome and determines a particular characteristic in an organism.

In short it is a piece or segment of chromosome.

Genes undergo mutation when their DNA sequence changes.