For many species, there are often regional differences in their genes, although most of the time this differences aren't noticeable in their outward appearance. 
        
             
        
        
        
<span>The correct answer is b: Coenzyme A.</span>
During the process of pyruvate oxidation, acetyl CoA molecule is produced. Pyruvate oxidation is the link between glycolysis and Krebs cycle and it converts pyruvate (three-carbon molecule) into acetyl-CoA ( two-carbon molecule attached to Coenzyme A). NADH is produced and one CO2 released. AcetylCoA is the substrate for the next stage of cellular respiration, citric acid cycle.
 
        
             
        
        
        
The answer is Several dendrites and one axon
Dendirtes functtion is to bring information to the body, meanwhile axon take away infotmation from the body.
The information flows to anothers neuron through this thing called synapse
        
             
        
        
        
A vestigial organ, something that has yet to fall prey to evolution, but no longer serves a purpose, or the purpose it used to serve.
        
             
        
        
        
The function of the respiratory system is to exchange two gases: oxygen and carbon dioxide.
Hope this helps :)