which of the following is a stage of prenatal development that spans the period from implantation to about the eighth week of pregnancy and during which the major organ systems begin to form??

best answer
  • The embryonic stage lasts about eight weeks. “During these eight weeks the organ systems will begin to form and develop and the embryo will look like a little tadpole growing to about 1 to 1.5 inches by the end of this period” says Dr. Perry. In the latter half of the embryonic stage tooth buds arms and legs can be seen.