[Blissey]

Are Doriads warm?
Can they root themselves to feed, much like normal plants would?
If so, do they produce sugar and oxygen, like plants do?
Honestly, are Doriads just humanoid plants (aside from the fact they're Spirits, but for science. . .) with most if not all functionality of a plant?
Did Doriads feed via photosynthesis when they were just trees? I'm assuming yes for this one, because they were. . . Trees.
Edit:
Can Doriads speak to other plant-life, flora, etc.?

I will be adding these answers to be Wiki, as well as any other answers to questions I've asked. . . It's only fair.