Misc: selva is another name for what?

Questions

What are the nine letters on the center row of a standard qwerty keyboard (from left to right)?

What are the only animals that copulate face to face?

What are the only food that astronauts do not have to treat & dehydrate when flying in space?

What are the only primes that end in 2 or 5?

What are the only two landlocked countries in South America (alphabetical order)?