D makes the most sense, the rest of them aren’t really logical.
        
                    
             
        
        
        
Answer: Increase in ambient global temperatures.
Recyling energy to be used again
Regulation of oxygen and carbon dioxide levels
An increase of erosion and siltation along waterways
Explanation:
 
        
             
        
        
        
Answer:
I'm a little on the fence, but I believe that organelle is either a paramecium or a euglena! 
Explanation:
 helpful little image link for comparison! 
[ source for organelle image comparison]
https://media.istockphoto.com/vectors/vector-illustrationof-unicellular-organisms-amoeba-proteus-paramecium-vector-id1225645059?k=20&m=1225645059&s=612x612&w=0&h=SzUbQXS7I0hh2NBcl5xsEKhPj21ebx6uRZHda7k0-hU=