2 kjdnkjanbbbbbbbbbbbbbbbbbbbExplanation:
 
        
             
        
        
        
Answer:
It is difficult to obtain a final conclusion with this information, but it is possible that the sample doesn't contain living organisms whose genetic material is composed of DNA. Another possible reason for this result is that the DNA extraction protocol used in the experiment is not suitable for this sample.
 
        
             
        
        
        
Answer:
Youngest to Oldest 
Shale with ammonite 
Limestone with unknown fossil
Basalt
Sandstone with trilobite
 
        
             
        
        
        
Answer:
In the bloodstream  
Explanation:
The metabolic breakdown of amino acids creates ammonia, which is especially toxic to the brain. The liver converts ammonia to urea, and it is then released into the bloodstream, where it travels to the kidneys and is excreted in the urine.
 
        
             
        
        
        
I would say C because it makes the most sense.. good luck!