If one could be reincarnated, Reivew on I Origins

First of all, the film is good in terms of plot, although the pace is a little slow. But after all, it is not a typical sci-fi film, it should be a drama film.
It is also reasonable for the film to attribute people to reincarnation.
But if it is considered logically that the population of the world is getting bigger and bigger, whose soul are those extra bodies filled with?

If you say it is the soul of an animal, is the total number of animals on the entire earth also growing continuously?
But in fact, I think even if there is a soul, those low-level animals do not have a soul.

If the extra souls come from outer space, then the number of intelligent life in the entire universe should also be increasing.

Also, does anyone have accurate data to compare with the global birth rate and death rate roughly comparable?

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