Which of the following labeled structures in the diagram is a site of red blood cell production in adult bones? 
Definitions:
Subroutine
A sequence of program instructions that perform a specific task, designed to be executed from multiple places within a larger program.
Data Structure
An efficient way of organizing and storing data in a computer so that it can be used effectively, examples include arrays, linked lists, trees, and graphs.
User-Defined
Refers to specific settings or customization options that a user can modify to meet their individual preferences or requirements.
Mutual Fund
An investment vehicle made up of a pool of funds collected from many investors for the purpose of investing in securities such as stocks, bonds, and other assets.
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