Explain what happened in Thebes

Theban forces under the command of Epaminondas ended the power of Sparta at the Battle of Leuctra in 371 BC. The Sacred Band of Thebes (an elite military unit) famously fell at the Battle of Chaeronea in 338 BC against Philip II and Alexander the Great. ... Modern Thebes is the largest town of the regional unit of Boeotia.

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this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.