====== 6. The Biological Age ======
The last 500 million years.

===== - Tree of Life =====
{{:bn:courses:ast100:tol.webp?nolink&850|}}

===== - History of Eukaryotes =====
{{:bn:courses:ast100:life-history.webp?nolink|}}

{{:bn:courses:ast100:gmst.webp?nolink|}}
===== - Mass Extinctions =====
{{:bn:courses:ast100:extinctions.webp?nolink|}}

===== - Near-Earth Objects =====
{{youtube>vfvo-Ujb_qk?large}}
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{{:bn:courses:ast100:nea.webp?nolink&600|}}

===== - Drake Equation =====
{{:bn:courses:ast100:drake.webp?nolink|}}