Answer: I would go with B. Here’s why: An index fossil is usually easily recognizable, and underwent a wide geographic distribution. What leads me to believe B is the correct answer, is because it’s something that existed “ all over the world”. 
 
        
             
        
        
        
Answer:
The osmolarity of mammalian urine may vary over time. The osmolarity of mammalian urine varies little between species. Mammalian urine is always hyperosmotic to blood. The osmolarity of mammalian urine may vary over time.
Explanation:
I hope it will help you 
 
        
                    
             
        
        
        
The answer is A//////////
        
             
        
        
        
An organism that eats decomposed items. For example plant detritus.