If I own both golgari germination and Lifeline, and a wrath is played I get to choose which activates first thus creating tokens just in time to save all the the creatures right?

In another scenario instead of golgari germination I had persist creatures, they wouldn't come back in time to save the other creatures right?

I don't think you've got that right Intrepid. The trigger condition for Lifeline is "a creature is put into a graveyard and a creature is in play".

603.4. A triggered ability may read “When/Whenever/At [trigger event], if [condition], [effect].” When the trigger event occurs, the ability checks whether the stated condition is true. The ability triggers only if it is; otherwise it does nothing. If the ability triggers, it checks the stated condition again as it resolves. If the condition isn’t true at that time, the ability is removed from the stack and does nothing. Note that this mirrors the check for legal targets. This rule is referred to as the “intervening ‘if’ clause” rule. (The word “if” has only its normal English meaning anywhere else in the text of a card; this rule only applies to an “if” that immediately follows a trigger condition.)

Here's the Oracle text on Lifeline:
"Whenever a creature is put into a graveyard from the battlefield, if another creature is on the battlefield, return the first card to the battlefield under its owner's control at the beginning of the next end step."
Because it breaks it up into a trigger for just the creature to graveyard, then a condition check for the rest of the ability, it does work the way I described. If the card's Oracle text were closer to its written text, you are right, Lifeline would not trigger at all.

I'm not sure why it was decided to go with that functionally different text; maybe it had to do with the 6th Edition rules change. I don't know enough about pre-6th rules to know how Lifeline worked back then.

If more than one creature is on the battlefield and all the creatures on the battlefield go to the graveyard at once, then none of them are returned at end of turn. This is because Lifeline's ability has an intervening-if clause, which means that there must be at least one creature on the battlefield at the time the ability resolves.

intreped, I don't think it does work that way.

So if I had a Stuffy Doll enchanted by a Sigil of the Nayan Gods and a Karmic Guide, and I controlled a Golgari Germination and a Lifeline, and someone cast Infest, and no other creatures had more than 2 toughness, would Lifeline's trigger go all the way to resolution? Could I stack triggers in the way I described to Bruticus? I believe I could get back the Karmic Guide but not the Stuffy Doll, but I want some verification on this one.

115.2a Triggered abilities can trigger at any time, including while a spell is being cast, an ability is being activated, or a spell or ability is resolving. (See rule 603, “Handling Triggered Abilities.”) However, nothing actually happens at the time an ability triggers. Each time a player would receive priority, each ability that has triggered but hasn’t yet been put on the stack is put on the stack. See rule 115.5.

115.5 Each time a player would get priority, the game first performs all applicable state-based actions as a single event (see rule 704, “State-Based Actions”), then repeats this process until no state-based actions are performed. Then triggered abilities are put on the stack (see rule 603, “Handling Triggered Abilities”). These steps repeat in order until no further state-based actions are performed and no abilities trigger. Then the player who would have received priority does so.

603.4 A triggered ability may read “When/Whenever/At [trigger event], if [condition], [effect].” When the trigger event occurs, the ability checks whether the stated condition is true. The ability triggers only if it is; otherwise it does nothing. If the ability triggers, it checks the stated condition again as it resolves. If the condition isn’t true at that time, the ability is removed from the stack and does nothing. Note that this mirrors the check for legal targets. This rule is referred to as the “intervening ‘if’ clause” rule. (The word “if” has only its normal English meaning anywhere else in the text of a card; this rule only applies to an “if” that immediately follows a trigger condition.)

So if I had a Stuffy Doll enchanted by a Sigil of the Nayan Gods and a Karmic Guide, and I controlled a Golgari Germination and a Lifeline, and someone cast Infest, and no other creatures had more than 2 toughness, would Lifeline's trigger go all the way to resolution? Could I stack triggers in the way I described to Bruticus? I believe I could get back the Karmic Guide but not the Stuffy Doll, but I want some verification on this one.

This is how I see it playing out: