The scale used is the Richter scale.
Hope it helped!
        
             
        
        
        
Good coronary circulation nourishes the heart and reduces the risk of a heart attack. Coronary arteries supply blood to the myocardium and other components of the heart. They originate from the left side of the heart at the base of the aorta. The heart muscles needs oxygen-rich blood to be able to carry out its functions. 
        
             
        
        
        
Answer:
Option B, Beriberi
Explanation:
Thiamin is caused due to the deficiency of vitamin B-1 /thiamine whose chemical name is thiamine pyrophosphate. Thiamin is a water soluble vitamin which occurs naturally and is a very essential nutrient as it plays an important role in energy metabolism and hence regulate the growth, development, and function of cells  
Thiamin is stored in liver for a short duration as its life is extremely short and thus it should be ingested regulary.  
The deficiency of thiamin causes  beriberi and thus food like  whole grains, meat, fish breads, cereals etc. must be taken in sufficient amount regularly.
 
        
                    
             
        
        
        
Answer:
Used cross breeding to purposely breed plants. Studied a variety of pea plant traits. studied several generations of pea plants.
Explanation: