The correct answer is d. morula. 
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A morula is a stage in early development, formed 3–4 days after fertilization. It is a 16-cell mass which forms a solid ball contained within the zona pellucida. A morula develops into a blastocyst.</span>
        
                    
             
        
        
        
Answer: Dolphins
Explanation:
Dolphins are well-documented as intelligent animals. They can recognize themselves in a mirror and communicate with each other. Their large brain is structured for awareness and emotion, and dolphin brains are even more structurally complex than those of humans.
 
        
             
        
        
        
The scientist you're looking for is an anthropologist. 
        
                    
             
        
        
        
I believe the answer is chromatid, although I'm not entirely sure.