B. He was the first person to observe and identify living cells.
        
             
        
        
        
Answer:
See explanation
Explanation:
When we talk about electrophilic substitution, we are talking about a substitution reaction in which the attacking agent is an electrophile. The electrophile attacks an electron rich area of a compound during the reaction.
The five membered furan ring is aromatic just as benzene. This aromatic structure is maintained during electrophilic substitution reaction. The attack of the electrophile generates a resonance stabilized intermediate whose canonical structures have been shown in the image attached.
 
        
             
        
        
        
To separate off different products in order of their boiling points. You do it by a process of heating and cooling in a horizontal condenser usually.
        
             
        
        
        
If the substance mixes with water it's polar. If it doesn't it ms non polar.