Central America connects North America to South America. Central America is made up of 7 countries not continents.
Central America is a part of the North American continent. The Isthmus of Panama is defined as the border between the continents of North and South America.
South America is one continent, and it does not have continents in it or on it because South America in itself is one big continent. There are countries in the continent of South America, but not continents.
It connects by North America and South America.
None. It is firmly set within the North American continent (or the American continent, depending on the number of continents you are taught). It however, connects two regions within the North American continent: the United States to the north and Central America to the south. Note Central America is a region, not a continent.
North America
There are no full continents in Canada. Canada is a part of the continent of North America.
No city connects the two continents, the Isthmus of Panama does.
One or two, depending on your definition of continent. For most people in the world, it borders just one continent: America. For Americans and Europeans, it borders two continents: North America and Central America.
North America is connected to south america
No continent connects to Antarctica. The closest continent is South America, which is about 600 miles away from the Antarctic Peninsula.
South America
South America is a continent. There are no other continents that overlap with it or include it.