Some examples would be the Silk trade or even their Food.
        
                    
             
        
        
        
I believe it would be Omo Kibish, southern Ethiopia.
        
             
        
        
        
The capital city of Costa Rica is San Jose.
Happy Studying ^=^
        
                    
             
        
        
        
1. Bushmeat
2. Cash Crop
3. Desalinization
4. Desertification
5. Globalization
6. Ground Water
7. Organic Farming
8. Sustainable
        
             
        
        
        
Answer: Hello your question is open ended hence I will provide a more general answer
answer : Use of systematic sampling method
Explanation:
To obtain a representative sample of pebbles ( more representative sample ) Leaners should use <em>Systematic sampling method</em> . This is because systematic sampling covers the the entire population by obtaining samples from the population of pebbles at regular intervals hence it is a more comprehensive system of sampling when compared to Random and stratified sampling