Long bones contain marrow.
http://en.wikipedia.org/wiki/Bone_marrow
It depends on what animal you are talking about, Jellyfish dont have bones, but if you are talking about a mammal, Yes.
The core of an apple is the central part that contains the seeds. It is typically cylindrical in shape and surrounded by the fruit's flesh.
The keystone of the facial bones is the maxilla, which forms the upper jaw and central part of the facial skeleton. It articulates with all other facial bones, providing structural support and forming the majority of the midface.
The white stuff found in the core of an apple is called the apple core or pith. It is the central part of the apple that contains seeds and is surrounded by the flesh of the fruit.
The spine itself is formed by a central core of nerves called the spinal cord, protected by many vertebrae, which are bones, each with a soft 'disc' in between for the purposes of flexibility and reduction of stress on the bones.
The central core has 5 regions which helps to regulate the basic life processes.
The inner core.
It would be C. central atomic core. Nucleus is always found at the center of the atom. This is not always the case for nucleus in the cells.
The nucleus.
core
Core is defined as "the central or innermost part."
The cranium
The central part of Earth below the mantle is the core. The core is divided into the outer core, made of liquid iron and nickel, and the inner core, which is solid due to high pressure despite being made of the same materials.
Medulla
Nucleus.
A ferrous core.
nucleaus