Wavelengths, light and the skin, fluorescent lights
        
             
        
        
        
Answer:
It helps the cactus live a long time between rainstorms.
Explanation:
A thick, waxy coating keeps the water inside the cactus from evaporating.
 
        
                    
             
        
        
        
Answer:
D. all of these answers are correct
Explanation:
Actin binding proteins are responsible for the regulation of cytoskeletal microfilaments.
Actin binding proteins have the function to 
1. Maintain the population of actin monomers, 
2. regulate the polymerization of filaments 
3. bind to and block the growing ends of actin filaments
4. assembly actin 
5. bind to the sides of actin filaments 
7. cross-link actin filaments
 
        
             
        
        
        
The bacterium Escherichia coli
        
             
        
        
        
The posterior opening is called the anus