I believe the answer is During<span> prophase
</span>The nucleus during mitosis. Micrographs illustrating the progressive stages ofmitosis<span> in a plant cell. </span>During<span> prophase, the chromosomes condense, the </span>nucleolus<span>disappears, and the </span>nuclear envelope<span> breaks down. At metaphase, the condensed chromosomes </span>
        
             
        
        
        
Answer:
A structure in the cell nucleus that contains DNA, histone protein, and other structural proteins.
Explanation:
If you have any questions feel free to ask in the comments - Mark
Also when you have the chance please mark me brainliest. 
 
        
                    
             
        
        
        
Enzymes are considered catalysts, they help reactants and can be used over and over
        
             
        
        
        
I believe the answer to this question is a food web.
Food Web definition: "<span>a series of organisms related by predator-prey and consumer-resource interactions; the entirety of interrelated food chains in an ecological community." 
Source: </span>http://www.dictionary.com/browse/food-web