Final answer:
The Romans imported more wine, olive oil, and wheat than they produced. North Africa played a significant role in supplying grain and olive oil to feed the urban population of Rome.
Step-by-step explanation:
The Romans imported more wine, olive oil, and wheat than they produced. Wine and olive oil were exported to various markets in the Mediterranean while wheat was imported from areas like Egypt to feed the growing urban population in Rome. North Africa played a significant role in supplying grain and olive oil, earning it the nickname 'the breadbasket of Rome'.