Answer: the blue squares are B and the white squares are BB
 
        
             
        
        
        
Its definitely not A, nor is it D because food webs and food chains can be either land or aquatic animals. i think its B because a food chain goes up and a food web includes more organisms
        
             
        
        
        
Answer:
Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment. During separation, the two strands of the DNA double helix uncoil at a specific location called the origin.
Explanation:
Hope this is helpful.
 
        
             
        
        
        
Answer: Nucleus!
Explanation:
The structure necessary for a mitochondria to produce new cells is the nucleus.
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The splitting in of oxygen to form water. At the end of the chain, electrons are transferred to molecular oxygen,which splits in half and takes up H plus to form water.