The middle portion of unspecialized mesoderm from which cartilage, bone, and blood develop is called .

The middle portion of the mesoderm that results in the formation of the connective tissues and other tissues, such as bone and cartilage is known as mesenchyme. The mesenchyme is the tissue which is composed of the loose cells embedded in the extracellular matrix composed of protein mesh and the fluid. These cells can migrate easily and thus, help in the development of the baby.

Hence, the answer is 'mesenchyme'.

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.