Aspartate + a- keto acid >> Oxaloacetate + a amino acid 
 This reaction is occur because the a- keto acid in the equation can come from any amino acid, the 15 N from aspartate is rapidly transferred to other amino acids.
15N is symbol use as the isotope of nitrogen with mass number 15. comprises of 0.4 % of stable nitrogen found, so the relative abundance of each in amino acid is simply a reflection of how much is found in nature in general.
This isotopes is enrichment of the labelled amino acids was determined following a previously developed procedure comprising by determination of the spectral purity of the selected natural abundance amino acids.
To learn more about  aspartate here
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Instead of burning coal to power our country we could use solar panels. As long as we have the sun we will have "free" energy. 
Instead of continuing to mine for metals, we could recycle metals and then less greenhouse gases would be released into Earth's atmosphere.
        
                    
             
        
        
        
Answer:
the heat from the air in the umm i am not sure tho 
Explanation:
sorry I get it qrong
 
        
             
        
        
        
The corect answer is: B. Intercalated disks.
I hope that helped! :)