Answer:
Los gemelos fraternos son "dicigóticos", lo que significa que se desarrollaron a partir de dos óvulos diferentes fertilizados por dos espermatozoides diferentes, mientras que los gemelos idénticos son "monocigóticos", es decir, se desarrollaron a partir de un solo óvulo fertilizado que se dividió.
Explanation:
 
        
             
        
        
        
Solving problems with science means that to solve the problem the scientific method is used. This method includes observing, research, hypothesis , test and conclusion with a help of lot high level theory. 
Without science there is not strict process to follow in order to resolve the problem end get to a solution. 
        
             
        
        
        
Explanation:
The answer is A.
When the body temperature returns to normal,the respiratory system sends a message to the skeletal system to stop shivering.
 
        
             
        
        
        
Clay because it’s a mixture of dirt and runoff/water
        
             
        
        
        
What substances are involved in controlling the production of sperm and eggs in humans? Hormones.