Plants and Animals are commonly found in Tundra Biomes.
        
             
        
        
        
Answer: B
Explanation:
The question wants to know what the expression is directly dependent on.
The sequence of genetic expression goes like this:
   DNA -> RNA -> protein
If we want to know the root cause of expression, we must look at the DNA, not the RNA or protein, because DNA determines the RNA and protein expression.
  
 The  Shape of subunits in DNA -> Sequence of bases coded for by the ribosome with RNA -> Arrangement of amino acids in the protein synthesized.
Why not C: Number of chromosomes present isn't a factor, because most humans, barring those with a genetic disorder, have 23.
 
        
                    
             
        
        
        
1.) similar fossils were found on different continents. 
2.)the continents seemed to fit together; they were like a spread apart puzzle. 
3.)geographical features and mountain ranges lined up with the same rock composition 
4.)glacier grooves in rocks led him to trace them out to where they started
:)