it has bone marrow
spongy
Like all bird bones they are relatively hollow inside, which makes them lightweight.
Yes, exoskeletons are like bones but bones are found in the inside of the body and an exoskeleton is found on the outside of the body (kind of like a protective shell)beetles have exoskeletons
Yep. That means their bones are on the inside, like yours. A lobster has an external- or exo-skeleton. Hard outer shell, no bones inside.
No, they do not.
Everything that doesn't flop around like a jellyfish!
Birds have hollow bones to help them fly. Solid bones would add to much weight and make it impossible to fly. They have crisscross structures to add support inside the bones.
23 bones
There are 5 bones
on inside , yes the bones hurt
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.
Animals like insects, have exoskeletons-basically they have no bones, and only have tough,protective, often shell like skin. Animals like cats, dogs, horses, giraffes and and birds are all endoskeletons- they have bones, and those bones are internal (on the inside of the skin).