who reproduction was explained in the 17th century?

Answer 1

Assuming you mean 'how' there were several explanations for reproduction in the 1600's but certainly a prevailing one was that women and men both produced "seed" at the point of orgasm and the intermingling of this seed caused conception. An alternative theory was that the woman was only the receptacle for the man's seed and simply grew the baby without any active role herself. The woman's menstrual blood was thought to nourish the baby in the womb and this is why periods stopped during pregnancy. Sex of the baby was thought to be determined by the balance of humours in the woman during pregnancy so what she ate and how she behaved was important.

These views were probably the prevalent thinking during the 17th century but there were also other explanations. Gradually in the 18th century these opinions changed as more medical evidence became apparent until we reached our present understanding in the 19-20th century. For more information try Lacquer's "Making Sex" for a history of the understanding of sex, gender and relevant reproductive issues from antiquity to today.

Answer 2

this makes no sense - rephrase the question

Answer 3

HOW?

no idea

Answer 4

why?

Answer 5

was it?