The scientific definition of evolution refers to changes in a species or population over time. 
Evolution is a long-term process. It may take millions of years and several generation for an evolution to occur. The cause of evolution can be genetic as well as environmental. The evolution is a result of mutation. Evolution generally gives rise to new species, that is different from its ancestral population. 
Population is a group of similar type of organisms.  These organisms live in the same habitat, require same resources and have same kind of habits. The most essential criteria that defines a population is that the organisms of a population can mate with each other and produce offspring. 
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Answer:
Explanation:
https://www.treehugger.com/natural-sciences/what-selective-breeding.html
https://en.wikipedia.org/wiki/Selective_breeding
https://www.yourgenome.org/facts/what-is-selective-breeding
http://www2.nau.edu/~gaud/bio301/content/selbrd.htm
https://www.britannica.com/science/selective-breeding
 
        
                    
             
        
        
        
All structures and their functions have cells