Biology                   F                                             I           E     G                           T           X     E                           N           T     N                           E           I     E                       R   S           N     P                     M A S S E X T I N C T I O N                     D               T     O               F O S S I L R E C O R D       L                       O                                           P A L E O N T O L O G I S T                     C                                     G E N E T I C D R I F T     P                         I                   E                         V                   R                       R E L A T I V E D A T I N G                     D           R       O             F           A           A       D           C O E V O L U T I O N                           S           I                         M   I   S           N A T U R A L S E L E C T I O N   I           G   H     D   P     V     C   D   L               E     A   E     O     R   E                   O     P   C     L     O   X                   R     T   I     U     F   F                   Y     A   A     T     O   O                         T   T     I     S   S                         I   I     O     S   S                         O   O     N     I   I                         N   N           L   L                                         S     Across Down 5 Relatively sudden global decrease in the diversity of life forms 6 Provides evidence about the history of life on Earth 7 Someone who studies fossils 8 Variation of relative frequency of different genotypes in a small population 10 Age of fossil is determined relative to something else 13 2 species evolve in response to changes in each other over time 16 The organisms able to adapt will survive   1 1 Ability to survive and reproduce 2 No longer in existence; that has ended or died out 3 The set of all genes or genetic information 4 Age of a fossil is determined by finding out absolute age of surrounding rock 9 An amount of time 11 A long and distinct period of history with a particular feature or characteristic 12 Remains or traces of life that hve been preserved over time 14 Very small fossils that it can be studied and identified only with a microscope 15 Distinctive fossil used to compare relative ages of fossils 17 A proposed explanation 18 Inherited characteristics that increases on oragnisms chance of survival 19 Formation of new and distinct species 20 Time over time   1
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