Why is the concept of th continents questionable? why?

Question

Why is the concept of th continents questionable? why?

Answer 1

you need to give more information, clarify what you mean.  Give some context for your question.  Based on what you present, I would say that there is no reason to question the concept, it seems a pretty clear idea that there are distinctly located landmasses that have unique histories and geography that allow us to define them as continents, as unique land masses that we term as "continents".

However, I can imagine certain circumstances (say when dealing with distribution of life forms) where the concept may not be approriate, that it doesn't provide a useful term of reference.

Answer 2

I've got no idea what "concept of th continents" you're referring to.  The concept that there are continents isn't worth questioning.