What is the difference between ancient Greek art and architecture and ancient Roman art and architecture?

Greek art is most noted for influencing our representation of the human figure. The Greeks analyzed the anatomy of their male "hero" figures, teaching us how to portray muscles, bones, natural stance and athletic poses both in sculpture and 2 demensional art. Though art has evolved much since the Greeks, each artist must learn the basics of representation before they can take their art in a more modern direction. Great artists such as Pablo Picasso perfected their realistic (Greek inspired) techniques before they diverted to their own style.