Question 1
Zoe and Zia are identical twins. Based on this, we know that they formed from the split of __________ during the __________ stage of development.
◦ two zygotes; embryonic
◦ a single zygote; germinal
◦ two zygotes; fetal
◦ a single zygote; embryonic
Question 2
Constance experienced what she thought was an extra heavy flow during her menstruation one month. According to the text, what is one possible explanation for this?