Each of the gene segments within the 2009 H1N1 influenza virus have been found in pigs for more than 10 years prior to the beginning of the 2009 H1N1 influenza outbreak. Pigs have long been considered a possible mixing vessel for influenza viruses that originate within pigs, birds and humans.
The art of the ancient Greeks and Romans is called classical art. This name is used also to describe later periods in which artists looked for their inspiration to this ancient style. The Romans learned sculpture and painting largely from the Greeks and helped to transmit Greek art to later ages.
Difference between Romans and Greeks is not hard to understand. They were both parts of important civilizations. These civilizations have shared much as the architecture and beliefs as they both existed during the same time and closer to one another. For example, think about the Roman and Greek mythologies about gods.