Answer:
for 16 it is heart. 
Explanation:
for 17 it is kidney to bladder
 
        
                    
             
        
        
        
Cation-exchange chromatography is used when the molecule of interest is positively charged, the stationary phase is negatively charged and positively charged molecules are loaded to be attracted to it. So, the amino acids with negative charge will elute the first. Glutamate, leucin, arginine is the order of elution because of their pI values ~3,  ~6  ~10.
 
        
             
        
        
        
I believe the answer would be D) kitchen scraps and grass clippings
        
                    
             
        
        
        
I don’t know the answer but i can recommend two app that might
AP Bio
Cel Biology-101
        
                    
             
        
        
        
Answer:
15 chromosomes
Explanation:
The endosperm is formed through double fertilization where one male gamete nucleus with polar nuclei to form a triploid nucleus called the primary endosperm. The endosperm therefore will contain 15 chromosomes since the polar nuclei is diploid and the male gamete is haploid forming a triploid nucleus.