Given a scientific question, generate a correct answer to it.

Input: Consider Input: What is the stored food in a seed called?

Output: endosperm

Input: Consider Input: What is contained in the cavity of a long bone's central shaft?

Output: marrow

Input: Consider Input: This calcification prevents diffusion of nutrients into the matrix, resulting in what dying and the opening up of cavities in the diaphysis cartilage?
Output: chondrocytes