Explanation:
Fear is a barrier as people fear being judged for things as there might be a stigma attached to it. When people are judged their problem isn't solved and instead worsened and they will feel compelled to keep their problems to themselves. 
 
        
             
        
        
        
Individual, population, community, biome, ecosystem
        
                    
             
        
        
        
Answer:
Two proteins that are present inside the same cell perform different functions because both proteins have different amino acid composition. 
Explanation: 
Amino acid is the building blocks of protein. Different proteins perform different functions due to their composition. These proteins are formed by the instructions given to the ribosome of the cell. 
 
        
             
        
        
        
Answer:
2: Amount of precipitation, average temperature
3: Desert
4: The tundra
5: All of the above
 
        
             
        
        
        
Answers; 
Ancient China
Earthenware, stoneware, and bronze were common mediums used in ancient China. 
Earthenware is clay fired at relatively low temperatures of between 1,000 to 1,150 degrees. 
Stoneware is made from a particular clay which is fired at a higher temperature of 1,200°C. This results in a more durable material, with a denser, stone-like quality.