Yes it is very rare
Yes it is, but the rarest is the RAINBOW DRAGON!!
Meteor+Lightning & Air+ Copper
There is a good chance that you will get a evergreen dragon but it is very rare (not impposible) to get a lichen dragon
There is no such thing as a Birthstone Dragon on DragonVale
You have to breed one; though it will be very hard.
No, they only have to be adults. However, the higher the dragon level, the higher the chances are of getting a rare dragon.
As of July 2012, there has not been a star dragon in DragonVale.
You don't breed a Kairos Dragon in DragonVale. You have to get parts to complete it.
To date, there is no grass dragon in DragonVale. You may be thinking of the plant dragon. See the related question.
The incubation time for a rainbow dragon in DragonVale is 48 hours.
Brass Dragon and Fire Dragon
love dragon and panlong dragon