Xylem is a very useful tissue in plants used for transportation of water from roots of a plant to its upper part for its proper growth
        
                    
             
        
        
        
Photosynthesis and cellular respiration are<u> chemical reactions</u> that occur in cells.
<h3>What is photosynthesis and cellular respiration?</h3>
Photosynthesis is the process of making food through carbon dioxide, water and sunlight. It is an anabolic reaction.
Cellular respiration is the process of breaking down of food molecules by oxygen. It is a catabolic reaction.
Thus, the correct option is a, chemical reaction
Learn more about cellular respiration
brainly.com/question/13721588
#SPJ1
 
        
             
        
        
        
Answer:
During telophase, a nuclear membrane forms around each set of chromosomes to separate the nuclear DNA from the cytoplasm.  
Explanation: 
Up above!
I hope this helps~!
 
        
             
        
        
        
Because they take place at an atomic level and are unable to be seen by the human eye