First lets deal with the game.
Questions should be of the form that would result in a purely Yes or No answer.
So I assume you are asking if it lives mostly on land as opposed to anything that is not land.
Het antwoord is Ja, meestal woont het op het land.
Yes, most of the time, it lives on land.
Now for some side comments that are not directly related to the game. I hope they are of some help to others. If I have made mistakes and am corrected, it will be helpful to me.
Aan of op?
Aan or op?
This is complex for English speakers. Also, this is my no means a complete summary of when to use aan and op.
If something is on in a vertical sort of way we use aan.
If something is on in a horizontal sort of way we use op.
But if you are talking about the edge or border of something then it is aan (on/along or at).
Aan de muur (since most walls are vertical)
Aan de kust (on the coast along the coast)
Aan zee (We spent our vacation at the seaside.)
Op zee - (The ship was at sea.)
Aan tafel We sit at the table.
Op tafel The bowl is on the table.
Aan land gaan go ashore (this implies an edge or border between a body of water and a piece of earth)
Op het land (on a piece of earth)
Well, I think in your question, it is op. But not because I used the rules above.
It is because when I heard op het land my mind immediately associated
it with a song in De Kleine Zeemeermin. Here is an excerpt from the song Geef me vleugels Give me wings.
ik mis de zon, ik mis de wind
I miss the sun, I miss the wind,
de geur van gras en bomen
the fragrance of grass and trees
ik mis een zacht en warm bed
I miss a soft and warm bed
om nachten in te dromen
at night to dream in
ik mis het leven op het land
I miss life on the land
maar leef mijn lot gedwee
but humbly endure my fate
een zeemeermin hoort daar niet thuis maar wel diep in de zee
a mermaid does not belong there (cannot be at home there), but does deep in the sea.
This is my best translation of what it says. I think it is a beautiful song. The quality of the shows that Studio 100 produces is wonderful. I was never disappointed.
You can see the whole song and more at http://www.studio100fan.nl/musicals/kle ... ngs&id=362