You are reading an article in the National Geographic about Tiktaalik (believed to be the evolutionary transition from fish to terrestrial tetrapods).This article is an example of

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This article in National Geographic is an example of secondary literature, which is a compilation or analysis of primary literature. Primary literature includes original scientific research published in peer-reviewed journals, while secondary literature includes reviews, books, and articles that summarize or interpret primary literature. Tertiary literature, on the other hand, includes resources like encyclopedias and textbooks that provide broad overviews of a particular topic. Quaternary literature is not a recognized category of scientific literature.

You Are Reading an Article in the National Geographic About