Not Your Father’s Evolution
(Feb. 2, 2012) A few bullet points can sum up the major steps in the history of life on Earth, à la PowerPoint:
(First slide) Genetic Evolution:
• 4.5 billion years ago, Earth coalesced out of dust and gas surrounding the sun.
• 3.8 billion years ago, life arose, in the form of simple replicators.
• 1.5 billon years ago, single-celled organisms with nuclei (eukaryotes) were synthesized from simpler cells which lacked nuclei (prokaryotes); followed half a billion years later by multi-cellular organisms.
• 500 million years ago, early plants and animals emerged from the “Cambrian Explosion.”
• 7 million years ago, our “hominid” lineage split off from that of chimpanzees.
(Second slide) Cultural Evolution:
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Lanphere Dunes Restoration
STAFF PICK / outdoors / 9:30 a.m.-12:30 p.m. Meet at Pacific Union School. Help remove non-native invasives at the Lanphere Dunes Unit of the Humboldt Bay National Wildlife Refuge. Tools and gloves provided, wear work clothes and bring water. Carpool to the protected site. 444-1397.
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ONE Comments
Comment / By abe / Today, 9:14 p.m.
No use fretting about it.