Hi, 
I think that you're missing some options, but here they are (let me know if I'm right!
-A population of wolves was introduced 
-The amount of disease in the deer population decreased
-More grass was planted 
Now, if the gene diversity decreased, it means that a lot of deer died. This could happen because wolves were introduced -this is the correct answer, and the wolves ate some deer. 
        
                    
             
        
        
        
Answer:
The heat given off by Earth's core is circulated through mantle convection.
Explanation:
Heating materials usually causes them to <em>expand</em>; as they become hotter, they also become less dense. Convection describes the transfer of heat from hot areas of liquids and gases to cooler ones. This causes the heated, less dense material to rise and more dense material to fall, as it’s pulled by gravity. Super-heated metal forming Earth’s central core heats rock in the mantle; the hot and cool rock slowly rise and sink- this circulation process is called mantle convection.
 
        
             
        
        
        
Which of the following bio molecules typically contains both nitrogen and phosphate? 
The answer to this question would be nucleic acids. That is because they contain a phosphate base and a nitrogen group.