Answer:
Theory is not definite, while Law is.
Explanation:
A Theory is an idea or set of ideas that has proven itself many times, but has certain loopholes that prevent absolute certainty.  Meanwhile, a Law is a Theory without loopholes.
 
        
                    
             
        
        
        
<em>by definition- a stem cell is an undifferentiated cell of a multi-cellular organism which is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.</em>
an example
Stem cells have the potential to be whatever they want to be. Stem cells are able to develop into many different types of cells and can repair your body. 
there are two types
adult stem cells and embryonic stem cells
 
        
             
        
        
        
First option, Echo sounding
        
                    
             
        
        
        
The kid is jumped and beat up from some bullies at school, he may be afraid that they will beat him again worse if he tells on them. <span>Fear of retribution.</span>
        
                    
             
        
        
        
Answer:
The answer is an adaptive value explanation.
Explanation:
Adaptive value is the effect that the behavior of an organism has on the reproductive fitness of the organism.
This can help offspring to cope with their new surrounding or condition.
It is a quantity that can be measured by contribution of an organism to the gene pool of their offspring. This measurement can be releasing of chemicals to avoid predators, sexual mimicry by some animals or trying to imitate so as mix with others.