The cell is the smallest functional unit of life, which is why it is sometimes referred to as the building block of life.
        
             
        
        
        
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 una correcta distancia del planeta respecto al sol, la presencia de  agua en el planeta, la presencia de la capa de ozono, La presencia de los elementos químicos esenciales, y el campo magnético terrestre 
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They hold DNA( hope this helps)
        
             
        
        
        
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the engineering of rice crops to withstand flooding and contain more nutrients
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hope this helps