When a woman's egg joins with a man's sperm. Fertilization usually takes place in a fallopian tube that links an ovary to the uterus. If the fertilized egg successfully travels down the fallopian tube and implants in the uterus, an embryo starts growing.
It is always hard to say what the "initial" cause is- the initial cause
is always caused by something else. I'd say in this case that the
initial cause was the positioning of Soviet nuclean weapons on Cuba,
which was a very tangeable threat to the US. The noticing of these
weapons by the US marked the start of the Crisis.
But you should
also see the positioning of the weapons on Cuba in a wider context of
the Cold war. Specifically, Cuba felt threatened due to the Bay of Pigs
Invasion in 1961 ( a year earlier) and this caused Cuba to invite
Soviet weapons as a protection.
Pretty sure it’s a juror who knows the defendant as whatever they decide on could be biased so they would want to remove them from the court.