Answer: glycolysis in the cytoplasm
step-by-step-explanation: Pyruvate is produced by glycolysis in the cytoplasm, but pyruvate oxidation takes place in the mitochondrial matrix (in eukaryotes). So, before the chemical reactions can begin, pyruvate must enter the mitochondrion, crossing its inner membrane and arriving at the matrix
 
        
                    
             
        
        
        
D) Circulatory system is the one that transports nutrients to body cells. 
        
                    
             
        
        
        
C. The recessive allele was hidden by the dominant allele.
 
        
                    
             
        
        
        
The answer to your question would be D
        
                    
             
        
        
        
Answer:
<em>e. speciation</em>
Explanation:
The definition of speciation is:  the evolutionary process by which populations evolve to become distinct species. 
In this scenario, the bears that were once of the same species evolved in order to adapt to their environment. Once they evolved, they could no longer produce with each other, as they are now different species.