premise: Of all the tissues and organs in the human body the nervous system is the most intricate and complex, consisting of more than one trillion neurons.
hypothesis: The sequence cell → tissue → organ → organ system identifies the levels of organization of body structures in a human from simplest to most complex.
hypothesis_graph_structure: The sequence cell → tissue → organ → organ system<>identifies<>the levels of organization of body structures in a human from simplest to most complex