300px|Fertilization in mammals. The sperm and ovum unite through fertilization, creating a conceptus that (over the course of 8-9 days) will implant in the uterine wall, where it will reside over the course of nine months. In humans, implantation is the stage of pregnancy at which the embryo adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is called a blastocyst. It is by this adhesion that the embryo receives oxygen and nutrients from the mother to be able to grow.
300px|Fertilization in mammals. The sperm and ovum unite through fertilization, creating a conceptus that (over the course of 8-9 days) will implant in the uterine wall, where it will reside over the course of nine months. In humans, implantation is the stage of human reproduction at which the embryo adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is called a blastocyst. Once this adhesion is successful, the female is considered to be pregnant and the embryo will receive oxygen and nutrients from the mother in order to grow.
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It is by this adhesion that the embryo receives
Once this adhesion is successful, the female is considered to be pregnant and the embryo will receive
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to be able
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