The basic shape of tooth is derived from dentin, which is a ____...

Dentin is a hard, mineralized tissue that forms the major part of a tooth, giving it its basic shape and structure. It is located beneath the enamel in the crown and the cementum in the root, surrounding the pulp cavity.

It is composed of approximately $70\%$ inorganic material (primarily hydroxyapatite crystals), $20\%$ organic material (mainly type I collagen), and $10\%$ water. Due to its high mineral content and structural matrix, dentin is classified as a calcified connective tissue.

Answer: calcified connective