National High School in Finance and Business 1, Rozova dolina St. 1421 Sofia, Bulgaria E-mail: firstname.lastname@example.org
Abstract. The aim of this paper is to clarify heritage of the English naturalist
Charles Darwin (1809 – 1882). It analyzes some of the key concepts in his evolution
theory. And more specifically the research subject covers the categories “variation”,
“struggle for existence” and “Natural selection” in the context of Darwin’s ideas as
well their relation published in his famous work “On the Origin of Species” (1959).
The research method used is content analysis.
Keywords: variation; struggle for existence; Natural selection.
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