Final answer:
The period from conception to implantation is called the 2) germinal stage of prenatal development. It lasts for about 1-2 weeks. Hence, 2) is correct.
Step-by-step explanation:
The period from conception to implantation is called the germinal stage of prenatal development. This stage lasts for about 1-2 weeks from fertilization to implantation in the uterus.
During this time, the zygote undergoes rapid cell division and forms a blastocyst, which then implants into the uterine lining.