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{{#ev:youtube|https://www.youtube.com/watch?v=RAdNCIIYXvo}}
{{#ev:youtube|https://www.youtube.com/watch?v=wissIOikrqc}}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Mass extinction, pages 64, 110, GCSE Combined Science Trilogy 2, Hodder, AQA '']