The answers would be:
Pelvis
Coroner's office
Here is more about your questions:
The pelvis is a good identifier when it comes to male and female because the features have distinct features. The female pelvis for example is broader and the inlet is much wider. It is structured that way to prepare the woman's body for pregnancy and child birth. 
Forensic anthropologists is a sub-category of anthropology. Forensic anthropologists examine skeletal remains to determine how an individual lived, died, and how long they were dead. They can also identify who they were. Forensic anthropologists can assist especially when the remains are badly decomposed. 
 
        
                    
             
        
        
        
Sperm cells come from the male
egg cells come from the female
        
             
        
        
        
Carbon is usually the result of burning fuels, cars, busses, taxi's