Because Photosynthesis is the process used by plants and some bacteria to create energy from sunlight. ... Cellular respiration uses glucose, or sugars, from food molecules and turns them into carbon dioxide.
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The human body has living cells that interact with other living cells (Food) and inorganic cells (Salt, Oxygen). It also has a lot of chemical reactions that simultaniously happen inside of it.
Inorganic systems usually do not interact with themselves, and the reactions are mostly exterior.
        
             
        
        
        
The first question is the first option (4 haploid cells; 2 diploid cells). 
The second question is the first option also (nitrogen).
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Answer:
the fine transparent tubular sheath which envelops the fibres of skeletal muscles.
 
        
             
        
        
        
QUESTION--> <span>The nucleolus is where _______ are constructed.
</span>ANSWER--> C) ribosomes