Embryonic stem cells, adult stem cells,<span> induced </span>pluripotent stem cells, and <span>mesenchymal stem cells</span>
B. the nervous system connects bones
I think number one is Strongly Linked and the second one is Less Linked. Hope this helps. If it's wrong sorry
If there were less greenhouse gases, much of the infrared radiation that is converted to heat today would not be trapped in the earth's atmosphere. The earth's temperature would cool, and a new Ice Age would occur. Many plants and animals could not survive in this new condition, oceans would freeze, and weather patterns would change.
Hope that helped
C: carbon and oxygen cycles are the most closely related in their role in sustaining life because they both include processes of exchanging themselves among different parts of the earth. E.g. they both process through the ground, in the air, etc.