1 Cropping an image means to select a rectangular region to use. 2  To crop an image: 3  Right click on the image file in the File Explorer, select Open With, Paint. 4  Right click on the Select item in the toolbar.  Depress the left mouse button at the upper left corner of the rectangular region you wish to select.
TNT is made by adding 3 NO 2 groups (from nitric acid) to toluene. At low temperatures, the mononitrotoluenes are made, and as the reaction temperature is increased the dinitro compounds are formed, until eventually TNT is formed. TNT is explosive for two reasons. First, it contains the elements carbon, oxygen and nitrogen, which means that when the material burns it produces highly stable substances (CO, CO 2 and N 2) with strong bonds, so releasing a great deal of energy.
Nucleotides are molecules consists of three parts-a nitrogen base, a five-carbon sugar and a phosphate group. DNA and RNA are made of the subunits called nucleotides. 3 people found this useful.ach nucleotide is composed of a sugar + a phosphate + a nitrogen base. The nitrogenous bases are Adenine which pairs with Thymine and Cytosine which pairs with Guanine.