Answer:
Decrease in carbon dioxide because they take in carbon dioxide for photosyenthesis process
Explanation:
 
        
                    
             
        
        
        
Answer: It would probably be A.
Explanation: Abrasion means scraping or wearing away. Therefore the correct sample is probably going to look smaller, smoother, and more even from all the scraping of the river currents.
Hope that helps!
 
        
                    
             
        
        
        
Lipids have no polymers. 
A lipid is formed when a glyceral combines with one or more fatty acids.
        
             
        
        
        
Answer:
The skeletal system provides the shape and form for our bodies in addition to supporting and protecting our bodies, allowing bodily movement, producing blood cells, and storing minerals. This system consists of bones, cartilage, and joints.
The primary function of the respiratory system is to supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body. The respiratory system does this through breathing. It consists of the nose, larynx, trachea, diaphragm, bronchi, and lungs.
 
        
                    
             
        
        
        
Answer: Racial classification 
Explanation: Racial classification can be defined as the way humans are classified based on their physical and social traits which they have such as how they look, their skin color, hair texture, the native languages they speak. 
Scientists used racial classification to learn how unique and different humans are.