A hydrogen bond is weaker than a covalent bond.
Part of the east coast of Greece is the Mediterranean Sea, adn the other part is the Black sea.
I have rescued a couple of them so I guess the answer must be yes. Whether they originated here or were brought in from elsewhere, possibly by people moving from either the mainland or other Ionion islands I dont know. There are also tortoises in Corfu. Again, origin unknown but seemed quite at home there. Hope this helps.
To the best of my knowledge, the major seas surrounding Greece are the Adriatic Sea in the west, the Mediterrenean Sea to the south, and the Aegian Sea to the east. There may be some regions of those seas that have been separately named, but I am unaware of them, if there are.
I guess that depends on what you consider a scientist. Certainly the ancient Greeks had some pretty important guys like Archimedes, but I bet if you look further back to other civilizations like, say, the Mayans, you'll probably find some there too. I don't know of any particular ones.