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Timeline of Discoveries and Contributions in Zoology:1668 - William HarveyDiscovered the circulation of blood in animals and described the process of embryonic development.1748 - Carolus LinnaeusDeveloped the Linnaean system of classification for living organisms, which is still used today.1749 - Jean Baptiste LamarckProposed the theory of inheritance of acquired characteristics, which suggested that traits acquired during an organism's lifetime could be passed down to its offspring.1824 - Theodor SchwannCoined the term "metabolism" and contributed to the understanding of the structure and function of animal cells.1859 - Charles DarwinPublished "On the Origin of Species," which introduced the theory of evolution by natural selection.1865 - Gregor MendelConducted experiments on pea plants and discovered the principles of heredity, laying the foundation for the field of genetics.1888 - Hans SpemannConducted experiments on embryonic development in amphibians and proposed the concept of embryonic induction.1900 - Hugo de VriesRediscovered the principles of heredity and proposed the concept of mutations as a mechanism for evolution.1910 - Thomas Hunt MorganConducted experiments on fruit flies and discovered the role of chromosomes in inheritance.1885 - Louis PasteurDeveloped pasteurization, which is used to sterilize food and beverages and prevent the spread of disease.
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