Answer:
Bone marrow
Step-by-step explanation:
Bone marrow is a source of adult stem cells (cells derived from adult tissue). They have the ability to self-renew but their differentiation potential is limited (they can only differentiate into cell types of the organ of their origin). So, we call them multipotent or unipotent. On the other side, embryonic stem cells can develop in any other type of differentiated cell type in the body (pluripotent). So, embryonic stem cells are more flexibile for use.