of all the influences the ancient greeks gave western civilization which one is the most important? why do you think it is the most important? how is it evidenced in our lives today

You can argue it's in the art and culture, i. e like Washington DC. Architect, Henry Bacon designed it after the Acropolis in Greece, hence the greece facades. Or even the State of Prometheus in Rockefeller Center down in NY. America's national symbol is the eagle of Zeus, ect.