Ok so here we go then!
After watching Prometheus i got alot of answeres to my questions,
but one ting has been on my mind now.

I get where the humans (us) came from according to the movie,
but i felt there was a missing creature in the ALIEN lifecycle.

ALIEN lifecycle:

Spacejocky black goo from out the pillars in the space ship " worms in the dirt = cobra snake thing.

Cobra snake thing bites man + romance with woman = squid like chest burster.

Squid like chest burster grows huge + eats spacejocky = first version of the Xenomorph.

So that all makes sence to me pretty much but remember the following scene where the 2 guys ware left behind in the spaceship because of the storm.
They found a whole pile of spacejocky's who had their chest bursted open, trying to get trough a door rite?
Where is the lifeform that spawned from the spacejocky's? :/
Thats been haunting me since i saw it since we all know whatever spawns from a chestburster can remain alive for ages.

What you guys thoughts on this?

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Infinite creativity!!!