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There are many of things what can be hard on the outside and sweet on the inside. There are a tons of candy that are like this.
it has bone marrow
wierd
you can describe your friends by how they act on the outside, what you know about their inside, and what makes you like them for them. My friends are quirky and delightfully so IOW not the status quo, individuals
A verterbrate animal has a bone on the outside like a spine.. but im guessing an athropod has an inside one? :D
it has bone marrow
spongy
Compact bone is the solid, hard, outside part of the bone. It looks like ivory and is extremely strong. Holes and channels run through it, carrying blood vessels and nerves from the periosteum, the bone's membrane covering, to its inner parts.Cancellous bone, which looks like a sponge, is inside the compact bone.
inside a bleeding heart is like a bone like we have but harder
Most bones consist of two types of bone: the cortical bone is the hard smooth bone on the outside and the cancellous bone is on the inside. The cancellous bone is spongey and fibrous and fills the medulla cavity of the bone. So yes, they do have a filled cavity, but it's most evident in long bones like the femur or humerus.
As the names suggest, compact bone is solid-looking, and forms the outer layers of all bone (and the shafts in long bones). Spongy bone looks like sponge, with small holes, and is found on the inside of bones and the expanded heads of long bones. As the names suggest, spongy bone is softer than the solid, compact bone. With the naked eye, you can see that the compact bone is smooth and located around the outside of a cross-section of bone. Spongy bone, on the other hand, is located on the inside and is very porous, like a sponge.
Bone Marrow is on the inside of our bones and it is there to help produce the three types of blood cells, as well as lymphocytes, which support the immune system. Marrow is a sponge-like texture unlike our actual bones which are hard.