il

1. he (third-person singular masculine subject pronoun for human subject)
2. it (third-person singular subject pronoun for grammatically masculine objects)
3. Impersonal subject; it

existe

1. inflection of exister:
2. inflection of exister:

plusieurs

several, many, a lot

hypothèses

plural of hypothèse

quant à

1. as for
2. according to

genèse

genesis

de la

1. of the
2. some; the feminine partitive article

trilogie

trilogy