<span>the high expense; electron microscopes are costly</span>
Explanation:
Their ability of producing the woman's sex cell is destroyed, now they can not produce eggs and their menstrual cycle is also stopped known as menopause.
Answer: D
Explanation:
During embryogenesis, hematopoiesis begins in week 3 in the Yolk Sac, in Pander´s Island or Wolff´s Island, commonly known as the "blood islands". These blood islands develop from the umbilical vesicle, allantois, and chorion. In week 5, blood production starts on the fetal liver, and finally, at week 12 it begins in the bone marrow, spleen and, thymus.
