Why individual souls reincarnate?
It enables the continuity of individual development alongside the collective one, which accelerates the evolutionary process.
Can a collective soul also reincarnate?
Some collective souls of relatively primitive organisms can reincarnate (although they normally evolve). Complex organisms such as humans, as a rule, reincarnate individually, although there are some indications that they may be connected to something that would be an equivalent of a collective ring.
Is there such thing as karma?
It is plausible that the situation and the body a soul is reincarnated into depends to some extent on the shape of the soul, which in turn is influenced by the earlier experiences and conduct. However, this is a much more complex phenomenon than usually presented (that would require a book on its own). So, the fact that somebody is born in unfortunate circumstances cannot be taken as a sign that this person had done something bad in shis previous life. Such a linear interpretations are far too simplistic.
To what extent is the material life affected by prenatal experiences?
The soul can affect the person through pre-set intents and its shape, which is reflected in one's character. This is why (in addition to genes) even infants have character. Some intents can have a lasting effect on the shape of the soul and so can influence subsequent lives, although the person may not be aware of it or its source. However, other factors (physical and social determinants and choices we make) can override such effects.
When does the soul reincarnate?
The soul reincarnates when a new body is formed in material reality that can resonate with its configuration. This is a very complex process that depends on the genetic material, but also fluctuations in the social environment may be involved to some extent. The soul does not fully connect with the body immediately but gradually, step by step (which is determined by the development of the ‘containers' - the body and mind). Thus, although an initial connection is normally established even before birth, new connections (with the same body) can be formed throughout one's life.