is short for adenosine diphosphate. An organic compound that is composed of adenosine and two phosphate groups. With the addition of another phosphate group

ADP is a short form for adenosine diphosphate.

Explanation: Adenosine diphosphate is a nucleotide having three constituents: Adenine, a ribose sugar and two phosphate groups. ADP takes part in cellular reactions involving production of ATP. When an additional phosphate group is added to adenosine diphosphate (ADP), adenosine triphosphate (ATP) is formed. ATP is a usable form of energy within the cell. ATP is an energy-rich compound found in the cells.

the organisms are not adapted to live in some communities or habitats.

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.