I believe it is nervous tissue
The rocky upper layer of the solid earth is called the "lithosphere". This rocky part includes the brittle upper portion of the mantle and also of the crust. It is bounded by the atmosphere above and of the asthenosphere which is another part of the upper portion of the mantle.
The answer is hydrogen bond between the complementary strands.
The humerus and femur are joint bones, while vertebrae and carpals connect together to create a much bigger bone.
