Our understanding of when fishes evolved into tetrapods
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/oldest-four-legged-animals
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-history
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/life-science