Answer:
The state of gathering together.
Explanation:
Concentration is a noun and it refer to the act of gatthering closely or the state of gathering together or condition of collecting things or substances together.
In biochemistry it can mean the measure of the ratio of mass to volume in a solute and ratio of mass to volume of a solvent in a solution.
The rotating movement along the earth's axis
Finger print easy to identify . DNA test. forssoic science . it's very useful crime investigate and etc
I think it is C not 100% sure though
