Biogeography, the study of the past and present distribution of living organisms, Comparative anatomy, the study of features of different species to look for evidence of a common ancestor, Evolution, the change in characteristics of living things over time, Homologous structures, parts of organisms that show evidence of a common ancestor, Fossil, the geologically altered remains of an organism that was once alive, Fossil record, a records of all fossils found on Earth, Palaeontologist, a scientist who studies fossils, Antibiotic, a medicine that kills bacteria or stops them reproducing, Hereditary, traits passed by parents to their offspring, Natural selection, the process where organisms that are better suited to their environment tend to survive and reproduce, passing their traits on to further generations, Pesticide, a substance that kills pests, such as insects or weeds, Adaptation, a change in the structure or function of an organism that has evolved over generations that makes it better suited to its environment, Gene, a unit of heredity passed from parents to offspring; made of DNA, Genetic variation, the difference in genes within individuals of a population.

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