Answer:
A catalyst 
Explanation:
Enzymes are not a catlysy
 
        
             
        
        
        
Answer:
Replacing skin defects has witnessed several developments over the centuries. It started with the introduction of skin grafting by Reverdin in 1871. Since then, varieties of skin grafting techniques have been used successfully. Despite being clinically useful, skin grafts have many limitations including the availability of the donor site especially in circumstances of extensive skin loss, immune rejection in allogenic skin grafts, pain, scarring, slow healing and infection.1,2 For these reasons, scientist have worked hard to find skin substitutes to replace skin defects without the need for a "natural" skin graft. These materials which are used to cover skin defects are called "Skin substitutes". This article briefly discusses the common types of skin substitutes and their clinical uses.
 
        
             
        
        
        
the answer to this question is c i hope this helped
 
        
                    
             
        
        
        
Explanation:
With a Child's blood type of O the parents will be a combination of: 
O and O 
or 
A and A 
or A and B 
or B and B.
Answer: 
Since we know the father is A, then the mother must be O. 
Since With the Parents' combination of blood types of A and O, the child can have the following possible blood types: A or O.
        
             
        
        
        
Zero degrees latitude is the line designating the Equator and divides the Earth into two equal hemispheres (north and south).