Final answer:
Osteosarcoma is the most common 1° malignant tumor of bone, usually occurring in children and young adults. It commonly affects the long bones of the arms or legs, and can spread to other parts of the body. Early detection and treatment are important for better outcomes.
Step-by-step explanation:
The most common 1° (primary) malignant tumor of bone is osteosarcoma. Osteosarcoma is a type of cancer that develops in the cells that form the bones. It usually occurs in children and young adults, and commonly affects the long bones of the arms or legs. Osteosarcoma can metastasize (spread) to other parts of the body, such as the lungs, but early detection and treatment can improve outcomes.