**MEGA SPOILERS**I just beat the game and was wondering about stuff

[Dante WolfWood]

umm,I Dont think dyne is an ancient either, I mean, wouldnt that make marlene an ancient too? I mean its possible but she OR he never did anything to contrast they're ancients...(him hearing his wife was an act of Human unconditional love, I mean think about it...and the fact he went alittle insane....Heres an equation for those math freaks :Unconditional love lost bc of betrayal+best friend has daughter+insanity=Hearing dead wife voices)

[Vlado]

For me, the fact that you hear children laughing at the end is a solid proof that humans survived.

[Ouch!]

Only part of Midgar (and the people) was destroyed and were killed because in the screenshots of Yuffie, Red and Vincent for Advent Children, you can see a busted-up Sister Ray and tonnes of people walking around and in a screenshot of a direction sign, there's a new place called Healin Lodge where apparently people could pray for their lost ones.

Keep in mind, all this vegitation was seen 500 years after Final Fantasy VII. Advent Children takes place two years later, so it's not a jungle yet, just the pile of rubble you described.

I think Lucrecia kills herself. What exactly happens after we see the cinema of Vincent's past?

You can meet Lucrecia in the second disc in a cave hidden under a waterfall. Vincent talks to her and stuff. When you come back in the third disc, she's gone and there's Vincent's final weapon, the Death Penalty.

And I also think that Dyne was an Ancient because he was able to hear Eleanor's (his dead wife) voice and Marlene might have been one to because she senses Aeris at the end.
And the children's laughter obviously has something to do with Advent Children.

Dyne was insane. He was hearing voices in his head. Would a dead woman really be calling to her husband to kill her daughter? I doubt it.

And I also think that maybe the Cetra lived in space because Sephiroth says they migrated to the planet and the screen of space must have something to do with the story.

He didn't say the migrated to the planet, they migrated across the planet, like wandering tribes. Everyone is a decendant of the Cetra because those were the original people to walk the planet. Then some tribes settled down and lost their ability to here the planet. Everyone else is a decendant of those Cetra settled.

[Dante WolfWood]

explained everything perfectly....good job.