Answer:
A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world.
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Answer:
D.
They break down dead organisms.
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Ribosomes are the building blocks of trna, that are produced in the mitochondria, aka the powerhouse of the cell
        
                    
             
        
        
        
Spermatogonia is my answer