Facts:   - death place: berlin    - known for: protists    - caption: oscar hertwig    - death date: 25 october 1922    - field: zoology      - birth date: 21 april 1849    - name: oscar hertwig    - image size: 150px    - nationality: german    - image: oskar hertwig.jpg    - birth place: friedberg , hesse   Based on these bullet points, write a short biography describing the life of oscar hertwig .
oscar hertwig -lrb- 21 april 1849 in friedberg -- 25 october 1922 in berlin -rrb- was a german zoologist and professor , who also wrote about the theory of evolution circa 1916 , over 55 years after charles darwin 's book `` the origin of species '' .he was the elder brother of zoologist-professor richard hertwig -lrb- 1850 -- 1937 -rrb- .the hertwig brothers were the most eminent scholars of ernst haeckel -lrb- and carl gegenbaur -rrb- from the university of jena .they were independent of haeckel 's philosophical speculations but took his ideas in a positive way to widen their concepts in zoology .initially , between 1879 -- 1883 , they performed embryological studies , especially on the theory of the coelom -lrb- 1881 -rrb- , the fluid-filled body cavity .these problems were based on the phylogenetic theorems of haeckel , i.e. the biogenic theory -lrb- german = biogenetisches grundgesetz -rrb- , and the `` gastraea theory '' .within 10 years , the two brothers moved apart to the north and south of germany .oscar hertwig later became a professor of anatomy in 1888 in berlin ; however , richard hertwig had moved 3 years prior , becoming a professor of zoology in munich from 1885 -- 1925 , at ludwig maximilians universität , where he served the last 40 years of his 50-year career as a professor at 4 universities .richard 's research focused on protists -lrb- the relationship between the nucleus and the plasm = `` kern-plasma-relation '' -rrb- , as well as on developmental physiological studies on sea urchins and frogs .he also wrote a leading zoology textbook .oscar hertwig was a leader in the field of comparative and causal animal-developmental history .he also wrote a leading textbook .he discovered fertilization of sea urchins , he recognized the role of the cell nucleus during inheritance and chromosome reduction during meiosis : in 1876 , he published his findings that fertilization includes the penetration of a spermatozoon into an egg cell .while oscar was well interested in developmental...