Racial immunities question

[TheTheos]

Hi, during last session our gaming group had a little dispute regarding some racial immunities. Could you please clear out doubts that some of us have!
The questions are:

1)Are Duergars immune to paralysis unless it is specifically mentioned that paralysis affects Duergars?

2)Are Duergars immune to Ghasts' paralysis?

Duergars' ability wrote:

Duergar Immunities: Duergar are immune to paralysis, phantasms, and poison. They gain a +2 racial bonus on saves against spells and spell-like abilities.

Ghasts' paralysis wrote:

Special Attacks paralysis (1d4+1 rounds, DC 15, affects elves normally)

3)Are half-elves considered to be elves for such effects as Ghouls' paralysis?

Half elves ability wrote:

Elf Blood: Half-elves count as both elves and humans for any effect related to race.

Ghoul's entry wrote:

Special Attacks paralysis (1d4+1 rounds, DC 13, elves are immune to this affect)

4)Can half-elves chose from both elves and humans favored class options?

[Chemlak]

1) Yes.
2) Yes.
3) Yes.
4) Someone else will have to answer this one.

[JoeJ]

4) No. Half-elves don't get either elf or human favored class options; they have their own.

[Nefreet]

1) Yes.
2) Yes.
3) Yes.
4) Yes, Half-elves may choose either Human or Elf (or Half-elf) racial favored class bonuses (as may Half-orcs with Humans and Orcs).

[Bronnwynn]

Nefreet is correct.

[Rub-Eta]

I third Nefrett!

@JoeJ: Just because there are half-elf favoured class bonuses it doesn't mean that they can't take human/elf favoured class bonuses. There are a lot of other things that are race specific where there is specifics for all three races, where half-elf can pick from all three.

[JoeJ]

I agree, Nefreet is correct. I was just going by the ARG; for some reason, I don't usually think of checking the FAQ.