Yes, you can wear rune and fight green dragons. I'm guessing this question is pertaining to Elvarg more than just regular green dragons. If that's the case, you can still fight Elvarg while wearing rune, you just can't wear the rune plate as you have to defeat Elvarg in order to wear it after returning to the Hero's Guild for your reward.
Yes; it is possible to defeat green dragons at a much lower level than 60. ;)
A bronze dragon's combat level is 124.
I would have to say combat level 89 or 77
Once you enter combat, it starts degrading. After it starts, even if you leave combat, it will still degrade.
Combat level in general is not relevant; specifically, you need Defense level 60.
No, level 128 ghosts that are in the RuneScape wilderness will not drop Dragon Full Helms. The only RuneScape monster that drops the Dragon Full Helm is the Mithril Dragon which has a combat level of 178 and drops the helm as a "very rare" drop.
You could depending on what specific skills you have trained.
Corrupt dragon armour offers similar stats to Dragon armour, however it degrades. Nothing will happen by simply wearing corrupt armour, however while in combat it will degrade and turn to dust by the end of its use. Otherwise, it is the harmless free-player counterpart of dragon armour.
To me any sort of Dragon Haircut(If you are a ranger or wearing rune armour)
Get an anti-dragon shield, dragonfire shield, or an antifire potion and an anti-dragon shield to stop the fire breath. Then just fight it like a normal enemy. If it's combat level is high compared to yours bring food and potions. If your fighting Elvarg, she will drain your prayer, too.
try going aroumd it and hit it on the back legs
it's for mems.to do it you need something like dragon weapons. Its is part of the style of combat tab.
the most expensive: blue partyhat the most useful combat weapon: corrupt dragon scimitar