In the skeletal system which are the two main tissue is responsible for structural support in the body

Bone Tissue and Connective Tissue

Explanation:

The two main tissues responsible for structural support are Bone Tissue and Connective Tissue.

Bone tissue has the supporting function and occurs in the bones of the vertebrate skeleton. It is a rigid fabric thanks to the presence of matrix rich in calcium, phosphorus and magnesium salts. In addition to these elements, the matrix is rich in collagen fibers, which provide some flexibility to the bone.

On the other hand, connective tissue is a connective tissue, composed of a large amount of extracellular matrix, cells and fibers. Its main functions are to provide support and fill gaps between tissues and nourish them. There are special types of connective tissue, each with a specific function. This varies mainly according to the matrix composition and the type of cells present.

answer; ///(b) it is composed of four protein chains and four heme groups;