The species would die out - as there would be no way to reproduce.
If the blood of the circulatory system is missing, then you have a dessicated corpse or mummy of some kind.
The reproductive system is important! In fact, without the reproductive system, species would not be able to reproduce and life would not exist!
IF there was not a male reproductive system then there would be no offspring.
Yes, in fact women and men who suffer from cancers/diseases of the uterus and male sex organs, will often have a hysterectomy or vasectomy respectively, to remove the organs. You will live, just be unable to have children of your own (especially if you have had a hysterectomy).
You wouldn't grow you will look like a kid
Death
It would depend on which animal you are referring to, mammals have much the same reproductive system. Birds, fish and insects which are also animals do not.
Firstly, we would not be alive if there was an eco-system member missing because every one is imporant. For example, trees. If they were missing we can't live because it provides us oxygen.
While all organ systems are important for overall functioning, the reproductive system is not essential for the immediate maintenance of the body. Failure of this system does not lead to immediate life-threatening consequences.
We would no long be able to have children and humans would die out.
If the reproductive system stopped working, a person would be unable to conceive and bear children. This can have emotional and psychological impacts, as well as implications for relationships and family planning choices. In some cases, medical interventions such as fertility treatments may be an option.