All of the following are forms of energy a living organism can use except nuclear energy. Nuclear energy is the use of nuclear reactions that release nuclear energy to generate heat ( thermal energy is being transferred between two objects).Exposure to any radioactive material and energy  is bad because the nuclear energy damages human body and cells.
 
        
                    
             
        
        
        
Answer:
single celled
Explanation:
because i asked a teacher
 
        
             
        
        
        
Answer:
Classification of biological organisms from most general to most specific is -
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species
Explanation:
A hierarchy system of taxa or ranks of living organisms up to species level is known as taxonomic classification. It includes a higher and most generalized rank domain consist of archaea, bacteria, and eukarya. Second most generalized ranks kingdom that consist of various kingdoms.
Less generalized ranks are in order of a decrease in general and an increase in specificity are phylum, class, order, and family and the most specific ranks are genus and species.
 
        
             
        
        
        
O2 (oxygen) is a covalent compound