Answer:
you could add an enzyme to speed up the reaction time and lower the amount of energy needed for the reaction
 
        
             
        
        
        
Ecology is environmental science. 
<span>Ecology- the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
    Hope this helps!</span>
        
             
        
        
        
Answer:
b
Explanation:
some are the same while others are different (traits)
 
        
             
        
        
        
Answer:
c
Explanation:
the environment is changing from ocean to dry land
 
        
                    
             
        
        
        
Answer:
 within the cartilage divide and secrete new matrix
Explanation:
Chondroblasts also called as perichondrial cells form chondrocytes which are the cells of cartilage. They also secrete the cartilage matrix which forms the cartilage. This matrix consists of collagen, fibers, proteoglycans, hyaluronic acid, water and glycoproteins. 
They divide within the formed cartilage too to secrete new matrix. They are called chondrocytes when they become a part of cartilage matrix. Here they grow the cartilage matrix by secreting more extracellular matrix rather than dividing. Once the cartilage formation is completed it is composed 10-20% of collagen fibers, 65-80% of water and rest is made by proteoglycan-hyaluronic acid aggregates.