I think this is an theory changing because a new scientific method was developed. They used what Mendel had learned to test the hypothesis themselves and discovered that he was right.
        
                    
             
        
        
        
Mendel was able to attribute the variation observed in the offspring of his experiment to the controlled fertilization process.
Mendel was able to control pollination and, thus, the fertilization process in the pea plants used for his experiment. 
Mendel was able to effectively predict the outcome with self-pollination or cross-pollination with different results coming from each. Thus, he logically concluded that the variation observed in the offspring of his crosses is due to the fact that he controlled the fertilization process.
More on Mendel's experiments can be found here: brainly.com/question/3186121?referrer=searchResults
 
        
             
        
        
        
Answer:
Nutrients support vital functions, including growth, the immune, the central nervous system, and preventing disease.
Explanation:
 
        
             
        
        
        
Fight or flight, because according to Hans Selye, this occurs at times of danger when your adrenaline is heightened.