What do you mean by chromatography?

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

This class has taught you that the use of science and medicine in practical ways has become an international endeavor. one of the greatest examples of an international science accomplishment is which allows the profiling of human dna, useful not only to science but also medicine. a) forensic science b) the fbi c) the human genome project d) bioterrorism