I would guess that the answer would be :'<span>These organisms dig more shallow burrows than they used to.</span>' If the crabs actively dig burrows, as many crab species do, and a layer of oil has persisted in the lower soil strata, it makes sense that the crabs would be reducing the depths of their burrows to avoid contact with the oil. The other possibility is that the crabs might might migrate to deeper waters, but this is less likely because the crabs would be evolved to utilise the intertidal zone. 
        
             
        
        
        
Answer:
The polymerase chain reaction relies upon unusual, heat-resistant __DNA polymerase molecules______ that were isolated from bacteria living in hot springs.
Explanation:
 
        
             
        
        
        
CO2molecule is a reactant in the first step and a final product in the fourth step of the Calvin-benson
        
             
        
        
        
Answer:
Each cell in your body has DNA, but the DNA formation was influenced by your parents. Their genes formed your genes.