Mineral spirits or rubbing alcahol
        
             
        
        
        
The answer to the 3rd question is that chromosomes are tightly coiled bundles of DNA and carry many genes. For the 4th question, asexual reproduction can occur by binary fission and creates exact genetic copies of a parent. 
        
                    
             
        
        
        
Answer:
1. At the end of S phase- 20 pg DNA
2. At the end of G2 phase-  20 Pg DNA
Explanation:
The cell before undergoing M phase undergoes the steps of interphase that is G₁, S and G₂ phase.
During S phase, the process of cell replication takes place which replicates the DNA as a result of which the amount of DNA doubles. This DNA amount is reduced to half during the anaphase stage of M phase.
In the question since the amount of DNA is 10pg therefore the amount will be double during S phase and becomes 20 pg and will remain 20 pg until the DNA is distributed therefore at the end of G₂ phase Will remain the 20 pg.
 
 
        
             
        
        
        
Probability is the measure of the likeliness that an event will occur. So.. probability.
        
                    
             
        
        
        
Photosynthesis, in the chloroplasts of the cells