Answer: tissue
Explanation:
All living organisms are made up of one or more cells. For example, unicellular organisms, such as amoebas, are made up of only one cell. Multicellular organisms, such as human beings, are made up of many cells. And cells in complex multicellular organisms  are organized into tissues,  which refers to similar groups of cells that work together on a specific task.
 
        
             
        
        
        
Cell division occurs in the final stage of mitosis called telophase. in this stage, the cell prepares for cytokenisis, in which the cell is split.
        
                    
             
        
        
        
Answer:
3) they lose energy at a varying rate - is the correct answer.
Radioactive decay is defined as the process by which an unstable atomic nucleus loses its energy by emitting radiations. The decay is random and cannot be predicted earlier.
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Explanation: