This app will stop working on 3rd April 2017. But you can still listen to BBC iPlayer Radio via your browser by visiting bbc.co.uk/radio
3/3 Adam Rutherford looks at the extinction of humans in the distant past. Last in series.
2/3 Are humans causing the sixth great mass extinction event in Earth's history?
1/3 Adam Rutherford asks why almost all of life became extinct 250 million years ago.