The ribosome, since all organisms need to synthesize proteins.
        
             
        
        
        
The secret of an endocrine gland that is transmitter by the blood to the tissue travel through the body .
        
             
        
        
        
After DNA replication has taken place, two molecules, each with one original and new strand is formed. This supports the idea of DNA replication.
        
             
        
        
        
The number of organsims at each levels, so there are more producer than herbivores, more herbivores than carnivores and so on...
        
                    
             
        
        
        
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❖ The homologous chromosomes (sister chromatids) move to opposite poles of the cell. The sister chromatids are pulled to opposite poles by spindle fibers.
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