Limestone.
It is a sedimentary rock composed of calcite and aragonite. It is used as a building material mainly because it is easily available and easy to work with. 
Limestone is used in the manufacture of steel as it is the primary raw material that helps to remove impurities from the iron ore and produces waste matter  that has low melting point and viscosity 
        
             
        
        
        
Answer:
A. stratified squamous epithelium; absorption
Explanation:
Stratified squamous epithelium are composed of multiple layers of cells which rest on a basement membrane. Superficial layers are made of squamous cells and underlying layers can also be made of cuboidal or columnar cells. 
Stratified squamous epithelium  is generally present in area where there is frequent physical or chemical abrasion. It protects the underlying structures from the stress. Hence, it is found wherever the body comes in contact with the outer environment like skin, digestive system and respiratory system. It also prevents water loss and desiccation. 
 
        
             
        
        
        
Competence is the answer to this question
 
        
             
        
        
        
Muscles and tissue will not be able to grow properly.
        
             
        
        
        
All visual pigments contain retinal
 derived from vitamin A