Answer:
Hey there!
I believe that David's prediction would be: If the amount of pollutants in the atmosphere reached an amount unhealthy for the salamanders, then the salamander population would decrease.
Let me know if this helps :)
 
        
             
        
        
        
First one - pivot join
Second one - Suture joint
Third one - Gliding joint
Fourth one - Hinge joint
Hope this helps!
-Payshence xoxo
        
             
        
        
        
D. All of the above 
There would be new plants and animal life in other locations, the layout of the land varies throughout the world, and there are different climates where soils are formed. 
I hope this helped
        
                    
             
        
        
        
Answer:
C. Succinate is the substrate, and fumarate is the product.
Explanation:
Succinate is the substrate of the enzyme Succinate dehydrogenase, and as a product is obtained fumarate.  In this scenario, malonic acid plays the role of a competitive inhibitor because its structure resembles the succinate's, so they compete for the active site of the enzyme.  So,  A option is wrong because fumarate is not the product. B option is wrong too because malonic acid is an inhibitor, not the substrate.  Also, D is incorrect because malonic acid is a COMPETITIVE inhibitor, not a noncompetitive one. Finally, E can´t be true because malonic acid is not product and fumarate is the product, not an inhibitor.