The signs are purely decorative, and they represent the various elements.
if you mean lightning you have to buy it, if you mean electric there is no such thing
If you mean food, you build a treat farm and grow it there.
experience. that's what makes you go up levels.
There is no dragonvale for PC
The rate means how much coins it will give in an amount of time.
I don't know i think people just mean 'lightning'!
DragonVale does not have redeem codes.
DragonVale is sometimes referred to as DV.
You will only see party hats while visiting your friend's DragonVale. You can touch the hats to collect some coins. There are only about 3 per friend's vale.
No you can't sell the Nursery on DragonVale.
DragonVale is a free download in the Apple App Store.
There is no such thing as a Birthstone Dragon on DragonVale