Bone Marrow Donor Canada How Can I Become A Bone Marrow Donor And Where Do They Take The Bone Marrow From?

How can i become a bone marrow donor and where do they take the bone marrow from? - bone marrow donor canada

I've heard about the case Jasmina with the girl who needs a bone marrow transplant. I want to help but want to know whether in the body, and I will be in a position more than once? Is it like donating blood, if u can do more than once? someone please reply.