Explanation:
Low power objective shows more field of view but does not give appreciable details about the view. 
- In the root tip of onions, the cell walls are distinctly visible and they are arranged in a rectangular mosaic pattern. 
- The nucleus stands out appreciably and it is tiny. 
- The cytoplasm is also visible. 
- Root cells do not have chloroplast since they do not take part in photosynthesis.
Learn more: 
Onion cell brainly.com/question/2855039
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Answer:
Change in the structure of chromosome.
Explanation:
Chromosome structure mutations are the changes that occur in the structure of chromosomes rather than just individual nucleotides. These mutations occurs due to the errors that happens in cell division that leads to the breaking in section of a chromosome, which can be duplicated or move onto another chromosome. Chromosome mutation is the process of change in the chromosomes that occurs due to the rearranged chromosome parts and  abnormal numbers of individual chromosomes.
 
        
             
        
        
        
Answer:
A mountinrange
Explanation:
because the plates are moving away from each other
 
        
             
        
        
        
Answer:
They allow for automatic biogeographic isolation
 
        
             
        
        
        
1. substrate 
2. active site 
3. reaction