C the increased outside contact due to the crusades
        
             
        
        
        
They perform the most essential tasks
        
             
        
        
        
Answer:a large influence
Explanation:the dancers doing kabuki shows how influencal the heian period by showing how long these have been going on for they have been going on for centuries
 
        
                    
             
        
        
        
Answer:
The first occurrence (chronologically) was 
Regional kingdoms began to replace most of the city-states of the northern region of Harappan Society.
Explanation:
Of all that are stated in the question, Regional kingdoms began to replace most of the city-states of the northern region of Harappan Society first occured
Around 4,350 years ago, many factors responsible for migration led people to abandon their settlements and migrate to southern and eastern regions of India, according to a study by Indian Institute of Technology Kharagpur.
This is also known as Indus valley civilization