Answer:
Sister chromatids on the top and Chromosomes on bottom
 
        
                    
             
        
        
        
The smallest living unit is actually a cell. An organelle is an organ inside of a cell. An organelle would not be considered alive because it can not survive without the other organelles. Whereas, a cell can survive without other cells.
        
                    
             
        
        
        
Answer: D. manipulating the DNA of cats.
Explanation:
Deoxyribonucleic acid (DNA) refers to the organic chemical which consists of genetic information. The DNA can be found in the cells of organisms. 
Since the new line of cats are genetically modified to eliminate or reduce their allergy-causing properties, then we can infer that the DNA of the cats have been manipulated. In this case, the allergy causing property won't be passed across to the offspring since the DNA has been manipulated. 
 
        
             
        
        
        
Answer: September 23, June 22, March 21, December 22