[lathspell]

1: Orcs do reproduce in the fashion of the Children of Iluvatar. Their are however few or no comments on female orcs in the books of Tolkien. Just as it is with the dwarves. They are there, but they are very unexplained in the works.
Orcs venture out long and far after anyone who kills one of their captains. But who doesn't go far to avenge their leader!?

2: Gloin tells Frodo in lotR that they do not achieve the works of their fathers in anything except with stonework. Not all dwarves could talk to ravens. The dwarves of Erebor are the only known race to do so, as the Men of Dale and their descendants could talk to thrushes.

3: I found the similarity of Pippin and Merry extraordinary great. In both cases they are the ones that begin the rousing. With the Ents they do not take part in the fighting, but that was because they couldn't. They didn't have the strength to participate in such a fight. Whereas with the rousing of the Shire, they themselves were roused to, for it was their homeland that was in bounds. They had the strength to oppose the enemies they met there.

4: I can not.

5: Elves can be as you describe, yes. But there are others as well, like Galadriel as she is in LotR.

As you know the Elves went Aman in the beginning of days and stayed there for quite a long time. After Morgoth stole the Silmarils Feanor urged them to follow, and so they fell under the Doom of Mandos. After the Wars of Beleriand, they were still under this Doom, and they were still exiles!

greetings