Going to say like my teacher told me Thomas Malthus and Charles like two figures who influence Darwins theory’s influence through his book on the population principal Darwin had a parallel thinking in the concept of individual struggle and natural selection
        
             
        
        
        
When a human dies, his corpses gets decomposed by decomposing bacteria. What's produced by the decomposing bacteria is the "fertilizer" for plants.
        
             
        
        
        
True. 
I know this because it happened to my family and friends families. Sorry if it’s wrong