response: Well no, they are mainly correlations, either positive or negative.
original_response: Yes she did.  Fertility factors  is based on a lot of things.
history: I grew up with 8 older siblings, pretty crazy right? I think it has something to do with a fertility factor, but I have no idea what that is really, can you explain it? Hey sure!  Fertility factors can determine the likely number of children a person will have. Hmm I see.  Do they cause that prediction of the number of kids?
knowledge: Fertility factors are mostly positive or negative correlations without certain causations.