D. The factors for heredity called alleles
DNA is an acid in the chromosomes in the center of the cells of living things. DNA determines the particular structure and functions of every cell and is responsible for characteristics being passed on from parents to their children.
An allele is a viable DNA coding that occupies a given location on a chromosome. 
 
        
             
        
        
        
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Curiosity is the stem from which experiments are born. Curiosity can lead to new innovations. Skepticism can help verify the accuracy of different innovations (i.e. medicine, technology, etc.)
 
        
                    
             
        
        
        
Answer:Un estudio de la Universidad de Barelona demuestra, por primera vez, cómo pueden separarse los genes a lo largo de los linajes evolutivos mediante el mecanismo de la retrotransposición, que es la síntesis de ADN a partir de ARN a través de la transcriptasa inversa.
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The egg shell would be most representative of the Earth's Mantle or "Crust", the yolk and white would represent the molten metal inside the earths core I assume.