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Evolution



              P                                        
        S E X U A L S E L E C T I O N                  
              N                                        
              C                                        
              T E M P O R A L I S O L A T I O N        
              U                                        
              A R T I F I C I A L S E L E C T I O N    
              T                                        
            B E H A V I O R A L I S O L A T I O N      
              D                                        
            G E O G R A P H I C I S O L A T I O N      
              Q                                        
              U                                        
              I M M I G R A T I O N             D      
              L                                 E      
G R A D U A L I S M                         H   E      
              B                             A   P   H  
              R E P R O D U C T I V E I S O L A T I O N
              I                     V   P   F   I   X  
              U                     O   E   L   M   G  
            E M I G R A T I O N     L   C   I   E   E  
                                    U   I   F       N  
                                    T   A   E       E  
                                    I   T           S  
                                    O   I              
                                    N   O              
                                        N              
Across Down
2 Indeviduals select mates based on heritable traits such as size, strength or coloration.
3 happens when two or more species reproduce at different times.
4 Nature provides the variations and humans select those they find useful.
5 Two pop'n capable of interbreeding develope differences in courtshio rituals or other behaviors.
6 When pop'n are seperated by barriers such as rivers, mountains or bodies of water.
7 Movement of individuals into an area occupied by existing pop'n.
9 slow steady pace of geoligic change.
12 Two populations become reproductively isolated and they can evolve into two seperate species.
15 Movement of indeviduals outside an area.
1 Equilibrium that has been interrupted by brief periods of rapid change.
8 Our planets history stretches back over a period of time that's so long it's hard for the human mind to imagine.
10 the time required for half the radioactive atoms in a sample to decay.
11 A group of genes that control the body plan of an embryo from head to tail.
13 The process of change over time
14 Formation of new species
 
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