If an entity doesn't harvest this lifetime, does it get another chance on Earth?

[MangusKhan]

Another way to look at senority by vibration is: those who have the highest possibility/probability of achieving harvestability are give the opportunity. If you are alive on earth right now, then you are within this category.

I have to point out a conflict of information here, as Ra stated back in the 1980s that basically half the human population on this planet hadn't even activated the heart yet. Not even once in all their lifetimes. They were essentially being born and dying in a way more akin to animals than individuated human souls. Knowing this, how can there be a line of individuated entities waiting on incarnations? There must still be billions of these primitive beings incarnate at this very moment.

I theorise that these beings automatically incarnate into the space/time locations that higher-vibrational beings don't want. For example, there are places/cultures in this world of such a basic and loveless nature that a more developed being simply wouldn't be able to progress if they were to incarnate there. The lessons they wish to learn just aren't available within any of the timelines within that particular space, and furthermore the risk of getting involved in karma would be too high. So the waiting line is for those births into areas of higher culture where the opportunities for spiritual development will be abundant, without much need for focus on the lower elements of existence like fear and survival.