This printable word search puzzle on the topic of US History (General) contains 20 hidden words in a 24x24 letter grid. Words go horizontally, vertically, backwards, and diagonally. This word search is also available to download as a Microsoft Word document or a PDF.
homologous structures
analogous structures
artificial selection
convergent evolution
vestigial structures
divergent evolution
adaptive radiation
natural selection
charles darwin
fossil record
biogeography
paleontology
coevolution
adaptation
embryology
extinction
population
evolution
variation
fitness