A responsibility is that you can take care of the child and a challenge is having to always be with the kid
That would be the artery in your neck (carotid artery) because it's the artery that will have the strongest beat as it's closer to the surface of the skin.
Embryonic stem cells are derived from embryos at a developmental stage before the time that implantation would normally occur in the uterus.
Answer:
I think the answer is c or d. Let me know if that is wrong or right.