Modern biochemistry grew out of the application of chemical techniques to biological problems. In many ways it combines biology and chemistry, but the subject now covers such a wide range that it is difficult to draw a neat border around biochemistry, which provides the foundations of pathology, pharmacology, physiology, genetics, zoology, botany, and even surgery and anatomy. The essential feature is that biochemistry uses molecular methods to explain biological processes, while other biological scientists study the integrated function of organs, organisms, and the complexes of organisms represented by ecosystems