grains seeds barley
The era where many plants, animals, diseases, and people were exchanged between the Old World and New World was called the Columbian Exchange.
It was the other way around. The Europeans got foods/plants from the New World. Potatoes, chocolate, tomatoes, corn are some of the new foods.
Yes.
Rice
potatomatoricecorn
greasy nuts from spain
The plants is native to both worlds, but the modern cultivated varieties were developed (bread) from New world stock, perversely in the Old world.
Exploration aided greatly in the exchange of plants and animals. For instance, when the English first came to North America, they brought back all kinds of plants and animals from the New World.
it is rose for the native plant in the old world
currently it is impossible to know the exact number! It can only be guessed as we are always finding new plants and animals
The contrast between the two sets of organisms, Old World and New World,
plants form new plants by pollination of each other