Which phrase is the **best** definition of *diffusion*? the transport of particles up a concentration gradient the movement of particles from a region of high concentration the movement through a cell membrane using atp the movement of particles from a region of low concentration to a region of high concentration

The movement of particles from a region of high concentration

Explanation:

Diffusion is driven by Brownian motion of molecules of a fluid. The kinetic energy of the molecules causes them to collide randomly. Most of these collisions are inelastic. In a highly concentrated region, the molecules collide at a higher frequency hence there will be some form of pressure exerted by these colliding molecules to the boundaries of the system. If its an open system and there is a region of lower concentration, these molecules will disperse to these regions until they are evenly distributed. The ‘system’ will have transformed into a lower energy state following the law of entropy of molecular disorder.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

the answer to your question is tooth decay.