Any area in a damp or closed surface.
        
             
        
        
        
The answer would be gas I believe 
        
             
        
        
        
X-linked disorder is a recessive autosomal disorder, which means that
There is a 1 in 4 chance (25%) of having a child who is unaffected.
There is a 1 in 4 chance (25%) of having a child who is affected by the condition. These children have two copies of the gene that do not work correctly.
There is a 1 in 2 chance (50%) of having a child who is a carrier of the condition.  These children have one working copy of the gene and one copy of the gene that does not work correctly.
 
        
                    
             
        
        
        
<u>Cell culture i</u>s the method applied by scientists to grown, cells in the laboratory setting to study the cells for particular reasons.
Explanation:
Cell culture is basically a method for survival, reproduction etc which are done under controlled conditions in the space outside the environment. This is also used for data mining.
 Purpose: Cell culture is used for propagation of virus 
Advantages:
- Vaccine production by replication of virus
- Detection of viral cell of virus
- Convenient easy and economical method
Disadvantages
- Maintenance of sterile aseptic conditions.  
- Increases microbial contamination
- Cross contamination takes place