The answer is the letter R !!
The answer to the riddle is "the letter 'R'." It appears in the word "rock" but not in "stone," in "morrow" but not in "bone," in "bolster" but not in "bed," and the phrase "I'm not living I'm not dead" suggests that it is a letter, which is neither alive nor dead.
The bone marrow
bones are living they grow gradually with bone marrow
the living components of a bone is the bone marrow and everything. the hard bone ain't living alright!!!!!!!!
There is yellow bone marrow and red bone marrow.
it is a bone that has a marrow in the middle of the musle that causes the bone to have a marrow biopsy
Bone marrow.
They are not made up of bone marrow, they just have bone marrow in them.
bone marrow
Marrow is inside of a bone that's why it's called bone Marrow
The bone marrow The bone marrow
leukaemia