<span>Edward Jenner is known as, “the father of
Immunology.” He was an English physician and scientist that made a smallpox
vaccine from the cowpox virus. This is known to be the world’s first vaccine
and this discovery is said have saved more lives than the work of any other
human being. Because of his work, World Health Organization declared smallpox
an eradicated disease in the 1979. Up to the year 2002, Jenner was still being
recognizes in the field of contemporary immunology and was even included in the
list of 100 Greatest Britons. </span>
        
                    
             
        
        
        
Answer:
When you have too little hemoglobin or not enough red blood cells, your body doesn't get enough oxygen so you feel tired or weak.
Explanation:
 
        
             
        
        
        
Overload, progression and specificity are the three basic principals of training that are the foundation for developing a successful personal fitness program.
        
             
        
        
        
Answer:
Ecological succession may also occur when the conditions of an environment suddenly and drastically change. A forest fires, wind storms, and human activities like agriculture all greatly alter the conditions of an environment.
Explanation:
 
        
             
        
        
        
Answer:
A
Explanation:
Ella did not preform enough trials to evaluate the pattern in the results.