That statement is partially correct. While protein is a major component of bone, it's not the only one. Here's a breakdown:

True:

* Collagen: This is the most abundant protein in bone, forming a framework that gives bone its strength and flexibility.

False:

* Bone is a complex material: While protein (collagen) is vital, bone also contains:

* Minerals: Primarily calcium phosphate, providing hardness and rigidity.

* Water: Makes up about 25% of bone weight, contributing to its flexibility and strength.

* Other proteins: Besides collagen, other proteins like osteocalcin and osteopontin contribute to bone formation and function.

Therefore, while protein is crucial for bone structure, it's only one part of a complex material with multiple components.