Hey there!
The answer is B, Pangaea. This was the name for the large continent that supposedly existed before we had all of our separate continents today (all of which were part of Pangaea).
Hope this helps
        
                    
             
        
        
        
Enzyme speed up the reaction and provide alternative reaction pathway,they accelerate the reaction and convert reactants into products
        
             
        
        
        
<span>They capture energy from sunlight and manufacture their own food</span>
        
             
        
        
        
Technology and industrialization are two top ones.
        
             
        
        
        
The classifications of the carbon as primary secondary tertiary and quaternary depends on the number of the carbon atoms attached to a carbon. In case, the carbon is attached to a single carbon, then it is referred as primary carbon. If the carbon is attached to two carbons, then it is referred as the secondary carbon, if the carbon is attached to three carbons then it is referred as tertiary, and if the  carbon forms all the bond with another carbon atom then it is referred as quatenary carbon.
The given below is the picture showing the primary, secondary, tertiary, and quarternary carbons in 4-isopropyl-2,4,5-trimethylheptane: