Answer:
Mutations
Explanation:
 A gene mutation is a permanent change in the DNA sequence of a gene. Mutations can occur in a single base pair or in a large segment of a chromosome and even span multiple genes. Mutations can result from endogenous (occurring during DNA replication) or exogenous (environmental) factors.
 
        
                    
             
        
        
        
Answer:
The correct answer will be- to provide smooth surface at the ends of synovial joint.
Explanation:
Articular cartilage is the white smooth tissue present at the end of the bones which covers the bones at the joints. The articular cartilage is devoid of the nerves, blood vessels and lymphatics but is exposed to the biochemical environment.
The cartilage at the joint helps in the movement of the bones by reducing the friction produced by gliding or sliding of the bones over each other.
Thus, to provide a smooth surface at the ends of synovial joint is the correct answer.
 
        
             
        
        
        
Answer:Metabolism is the term for a set of chemical reactions that occur in the cells of living organisms to sustain life. The metabolic processes lead to growth and reproduction and allow living organisms to maintain their structures and respond to the surrounding environment.
Explanation:cause i said so
 
        
             
        
        
        
The answer for the picture put up is D, not C. 
D is the correct answer.