Since you provide no further information, 
That Liquid 2 is very likely to contain alcohol. When the alcohol is ignited, it's not the liquid part that is burning.  When the temperature around the alcohol is increased, the liquid will produce Vapors. this vapor is the one that keep burning
        
             
        
        
        
Answer:
The significant degrees of association in the body, from the least difficult to the most perplexing are: particles, atoms, organelles, cells, tissues, organs, organ frameworks, and the human living being.
 
        
                    
             
        
        
        
Answer:
  d. Lysine is replaced by tryptophan (nonpolar)
Explanation:
Amino acid substitutions can have varying affects on the protein function, depending on the specific substitution and the location of the substitution.
If the substitution occurs in an important region, for example an enzyme active site, then the function of the protein could be destroyed.
Additionally, if the substitution replaces the amino acid with a highly different amino acid with different properties (eg. polarity), it could alter the structure and function of the protein.
Replacing lysine (polar) with a tryptophan (non-polar) changes the properties of the amino acid at that location, whereas the other substitutions do not. 
 
        
             
        
        
        
In humans, the placenta is essential to the embryo for RESPIRATION, NUTRITION AND EXCRETION.
The placenta refers to an organ in the uterus of pregnant mammals that is responsible for nourishing and maintaining the unborn baby through the umbilical cord. Th placenta has many functions but primarily it plays critical roles in the nutrition, respiration and excretion of the fetus. Its other functions include: production of hormones, production of immunity for the fetus for prevention from infections, etc. <span />