History of LIfe2 Crossword
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
 
 
Down: 1) many species become extinct during a short time2) the evolution of species by the gradual addition of small genetic changes over long periods of time4) the process by which a single species evolves into several different forms that live in different ways Across: 3) the pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change5) the changes which take place in clades that are larger than a simple species6) caused by slow and steady process of natural selection7) unrelated organisms independently evolve similarities8) when two species evolve in response to each other9) 
 

 

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