5.3

1. This definition comprises several levels 

 2. Reasons for extinction 

 3. Environmental performance index EPI

 4. Numbers as representation of species  

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Sources: 

1. _{https://www.unesco.pl/fileadmin/user_upload/pdf/BIODIVERSITY_FACTSHEET.pdf page 2}
2. _{http://www.coastalwiki.org/wiki/File:CausesSpeciesLossMap.jpg and: Luypaert T., Hagan J.G., McCarthy M.L., Poti M. 2020. Status of Marine Biodiversity in the Anthropocene. In: Jungblut S., Liebich V., Bode-Dalby M. (eds) YOUMARES 9 - The Oceans: Our Research, Our Future. Springer, Cham. https://doi.org/10.1007/978-3-030-20389-4_4}
3. _{https://en.wikipedia.org/wiki/Conservation_biology#/media/File:2016_EPI_Ecosystem_Vitality_Objective_-_Biodiversity_and_Habitat_(26170609028).jpg}
4. _{http://sustainablefootprint.org/wp-content/uploads/2012/01/functionalgoups-ecosystems1.gif}