1Find someone who knows!1.How old is the oldest fossil evidence of life on Earth? •What was it? •Was it a prokaryote or a eukaryote?•What environment do scientists think it was from? •How long was Earth around without evidence of life? 2.List the 6 “kingdoms” of Life. 3.What is the difference between “evolution”and “natural selection”? Earliest fossil record of life•3.5 billion years old –oldest rocks on Earth 3.8 billion years old•Earth not around for long without it!•microscopic filament •from Western Australia•Archae-bacteria(prokaryotic)- live in acidic hot-springs and undersea vents; using chemo-synthesis to produce energy.•found in chert- a hydrogenous mineral–hydrothermal or normal marine/lake sediment deposits•New evidence that the first sign of life on Earth occurred in deep ocean around hot vents (“Palaeotemperature trend for Precambrian life inferred from resurrected proteins”, Nature, Feb. 2008).Schopf, Science, 1993Prokaryotes (“before cells”(1) Archea(2) Bacteria (Prokaryotes, “before cells”)Eucaryotes (“true cells”)(3) Protoctists(mixed-bag of single-celled organisms, marine Algae, etc.)(4) Fungi(5) Animals(6) PlantsKingdoms of LifeTable 13-4, p. 375
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