So if you have an 'en' noun that ends in 'el' and you want to form the definite article, you just add 'n' rather than 'en'?
Yes, exactly. Except in the dialect of Småland, which changes the el to le, then adds an n. So it would be spindlen, cyklen, biblen, etc. But I'm mentioning that only as trivia. :)
you should make it more harder , i only had to choose from "the" "The" "spider"
Using the mobile interface, I presume? I don't think the course admins can affect that - it's a general annoying fault with Duolingo on mobile/tablet.
So do you think it would be more fun on laptop??
Different strokes, I suppose - I actually use both the desktop, the Android phone and the iOS iPad versions. They all have their pros and cons. Ultimately, I prefer the desktop version, but I don't hate on any of them. :)
The voices on my mobile android are very difficult to understand. I like using the laptop.
Is the translation "a spider " right as well?
No, this is strictly definite article. "A spider" would be "en spindel".
No it has to be the spider