Q:
      
      
         
            
Gastrulation is the process that directly forms the
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) All of the above         
         
Explanation: Gastrulation rearranges the cells of the blastula and ultimately forms the three germ layers of the embryo. The primary layers that will form all of the major body and organ systems of the organism, these germ layers include the ectoderm, mesoderm, and endoderm.
       
      
      
      
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