if you are talking about the process to form a baby inside the womb nothing comes before sperm it is there from the beginning
the color of your blood before it comes out of your veins is blue
It means you need to go to the ER
Yes, that is possible.
Pre ejaculation which works as lubrication but can also contain sperm. Whether a guy has it or not is individual.
No connection at all. Platelet donation comes from a blood donation which has no link to sperm count.
If you have reached puberty the sperm is mature. Before puberty you have semen but no sperm. To see if the sperm is no good when it comes to impregnate someone that can only be seen in a microscope.
No. The child is a unique mix of both of its parents.
sperm comes out when you have sex,or when you watch sexual videos.or masturbate.
If you mean there is blood when you ejaculate, or "come", there shouldn't be. Go and see a doctor. It's probably something minor, but you need to get it checked.
Sperm comes into the semen when you reach puberty, not before. Semen can be there and you might be able to ejaculate but unless the 9yo has entered puberty he can not.
If you are a women and you want to know when the sperm comes out look for gestures and movement of your male partner if you are a male you will know when the sperm comes out because you can fell it