Answer:
im just doing this for the points :) 
Explanation:
 
        
             
        
        
        
Answer:
Ancient India cast system 
 
        
             
        
        
        
Answer:
C. Humans have been on Earth for a very short amount of time
Explanation:
using process of elimination, insects were around before dinosaurs were so that takes away B and C, then humans have been on earth for around 200,000 years which definitely isn't hundred of millions so it's most likely C