Answer:
The fact that you have a task set in mind is something that can make you persist. The urge to satisfy your need to finish that task with the sharp tool is what drives you to persist with using the sharp tool knowing what could be the possible outcome of using it. 
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The answer is.d. stromatolites hope it help
        
             
        
        
        
Answer:
 kingdom, phylum, class, order, family, genus, and species.
Explanation:
 kingdom, phylum, class, order, family, genus, and species.
 
        
             
        
        
        
Answer:
Most birth defects can't be prevented, but you can take some steps to reduce the likelihood of environmental effects. Remember to always discuss your concerns with your healthcare provider and follow their instructions regarding screening tests, medications, etc.
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Anything can come out of that but I think type b might be more possible to happen.