Answer:
C. A dead organism 
Explanation:
A body is said to be in equilibrium if there is no likelihood of a change with relation to time. This also means that there is no detectable change in such a system.
However in relation to Biology a body is said to be equilibrium when it is dead. The metabolic state of the organism is usually zero and in a state of rest. There is absence of internal and external biochemical activity. Having life in carrying out cellular activities is the main determinant in the equilibrium state of an organism.
 
        
             
        
        
        
Unlike natural selection, genetic drift does not depend on an allele's beneficial or harmful effects. Instead, drift changes allele frequencies purely by chance, as random subsets of individuals (and the gametes of those individuals) are sampled to produce the next generation.
        
             
        
        
        
Answer:
To move in a circular or curving course or orbit: The earth revolves around the sun. to turn around or rotate, as on an axis: The wheel revolves slowly.
Explanation: