**Blood Donor**: Person who voluntarily gives blood for transfusions.

**Organ Donor**: Individual donating organs for transplantation purposes.

**Charitable Donor**: Entity giving money or goods to charity.

**Bone Marrow Donor**: Person providing bone marrow for medical treatment.

**Tissue Donor**: Individual donating tissue samples for research or transplanting.

**Living Organism Contributor**: An organism contributing biologically, e.g., plants in ecology.