No, there are many island nations (http://en.wikipedia.org/wiki/List_of_island_countries), though many of these are grouped with nearby continents (Malta, Ireland and the United Kingdom are usually grouped with Europe, though they are island nations). Oceania is used as a continent-level group name for Pacific Ocean island nations and territories.
No, not every country is part of a continent. Some countries are considered transcontinental, meaning they span multiple continents or are located on islands that are not considered part of a specific continent. Examples include Russia, Turkey, and Indonesia.
Every country belongs to a continent. Perhaps you mean which continent is not owned by a country, in which case the answer is Antarctica.
Islam is a religon, not a country ok. And Muslims are located all over the world and in every inhabited continent.
No country is on every continent
Brazil is located in South America, the fourth largest continent in terms of land area. It is the largest country in South America, occupying about half of the continent's landmass. Brazil shares borders with every South American country except for Chile and Ecuador.
Everywhere, in every country and on every continent.
Beef comes from every country in the world of every continent except Antarctica.
Hindu is not a country or region, it is a religious belief system. Asia holds the majority of Hindu people, but you can find Hindu people on nearly every continent (not sure about Antarctica).
Horses are found on every continent and every country except Antarctica.
wetlands are located in every continent except Antarctica
Everywhere. Its grown in every continent and every country in the world
Australia is the only continent all of which is also one country.