Answer:
The correct answer is c. Fatty acids
Explanation:
There are four major types of macromolecules present in nature and that are carbohydrates(polysaccharides), proteins, lipids, and nucleic acids. These macromolecules are polymers and are made up of monomer units.  
The monomeric unit of polysaccharides is mainly glucose, of protein is amino acids, of nucleic acid is nucleotides and the monomeric unit of lipid is fatty acids. Ribosomes are macromolecules because it is made up of RNA  and proteins.
So fatty acid is a monomer which joins together to form large macromolecules like lipids. Fatty acids are made up of a hydrocarbon chain which have one attached COOH group at the terminal position.
Therefore the correct answer is c. Fatty acids.
 
        
             
        
        
        
This weak section of blood vessel is called an ANEURYSM. Aneurysm is defined as an excessive localized enlargement of an artery which is caused by the weakness of the artery wall. This weakness allows the artery to increase in size abnormally. 
        
             
        
        
        
During mitosis the cell splits and becomes two
        
                    
             
        
        
        
<h2>Visceral pleura</h2>
Explanation:
The portion of the serous membrane that covers and adheres to the lung is called visceral pleura
- Pleura are the pair of membranous linings surrounding the lungs
- The visceral pleura covers each lung surface, and the parietal pleura covers the inner surface of the thoracic cavity
- The visceral pleura is a delicate membrane which dips into the fissures between the lobes of the lung
- Pleura allows the lungs to move inside the body cavity without friction as friction would cause damage to the lungs and the tissue in the chest wall
 
        
        
        
Im not sure but i believe it could be C