why and how we reproduce?

HOW WE REPRODUCE: the male reproductive system and the female reproductive system are necessary to create a new live. The male introduce 300 or 400 millions of sperms, the one which swims in the uterus, with a time of 1 or 2 hours and then the sperm enters in the ovule, fertilizing it, that process that is called zygote, like that is formed the baby,  taking in to a count a development of organs, body , brain in nine months.

WHY WE REPRODUCE: the life cycle is something necessary to create a new life ,that lives for generation and generation and the person do the same, for human being never be extinct other species do the same, like animals and some plants. There is other form to make a new life, is called asexual reproduction, the sea horse can reproduce when is not necessary to have a partner also it can clone.