Answer:
two carbon atom and six hydrogen atoms join together to form ethane.
Explanation:
Which scientist developed the idea that microorganisms can cause diseases?  Paul Ehrlich
 
        
             
        
        
        
Answer:
The two types of cells that never go through cell division once fully formed are nerve cells and muscle cells.
Explanation: 
The nerve cells and the muscle cells not undergo cell division after formation, because they can never re grow or cannot be repaired once they are mature. We should take good care of it once they are matured. They just under division from being baby to teenagers after that they stop undergoing cell division. This is true for both elephants as well as human beings. This thing is also applicable in case of bones. 
 
        
             
        
        
        
Answer:
1/4 suffer from hemophilia 
1/4 are heterozygous 
Explanation:
So since they are normal but their son isn't it is assumed that the mom is the carrier since the dad has to be X^HY
 X^HY x  X^HX^h
Set up a pedigree 
X^HX^H X^HX^h
X^HY     X^hY
1/4 suffer from hemophilia (X^h)
1/4 are heterozygous (X^HX^h)