Each hemoglobin molecule is made up of four heme groups surrounding a globin group, forming a tetrahedral structure
This is all I know about this, let me know if you still have questions ;)
 
        
             
        
        
        
Foods that contain more than one type of molecule help us meet our daily requirement of nutrients. There is a limit to how much we can eat in a day, so if nutrient rich foods are consumed, we can easily provide the necessary building blocks for our bodies to maintain healthy function. This is not possible with foods that contain only one type of molecule.
        
             
        
        
        
Answer:
A
Explanation:
Energy cannot be created nor destroyed.
 
        
                    
             
        
        
        
E. Digesting.....food because it helps
        
             
        
        
        
~Hello There!~
The answer is serotonin.
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- Hannah ❤