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Prior to birth, as all of the systems continue developing, neurons are at work contributing to the development of the fetus. After the baby is born, neurons are still at work. They start to die down around 12 months after birth. New neurons will continue to work well into the adulthood of the human being.

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9th week- birth
This is the period where most of the organ systems and structures start developing. Here is when the weight gain comes into play, reproductive, brain and nervous systems start to develop.

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3rd-8th week
After a couple weeks, the organism will drop and implant itself on the wall of the uterus, where it'll continue to grow into an embryo.

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Mitosis is the dividing process of the cells. It is here that two cells are created with the same chromosomes in each.

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2 weeks
In this stage is where the sperm's chromosomes become part of the fertilized ovum. Both the male and female give their chromosomes to the zygote. Here is when the zygote begins to divide and multiply.

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Conception is where the sperm fertilizes a woman's egg. This is where traits start being inherited.