Bio17 The History of Life

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How Fossils Form Water carries small rock particles to lakes and seas. Active art

How Fossils Form Dead organisms are buried by layers of sediment, which forms new rock.

How Fossils Form The preserved remains may be later discovered and studied.

[object Object],Vendian 650–544

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Permian Carboniferous Devonian Silurian Ordovician Cambrian 290–245 360–290 410–360 440–410 505–440 544–505

Cretaceous Jurassic Triassic 145–65 208–145 245–208

[object Object],First humans First prokaryotes First land plants First multicellular organisms First eukaryotes Radiation of mammals Accumulation of atmospheric oxygen Movie Cenozoic Era Mesozoic Era Paleozoic Era Precambrian Time

Formation of Earth ,[object Object],[object Object]

The First Organic Molecules ,[object Object],Mixture of gases simulating atmosphere of early Earth Condensation chamber Spark simulating lightning storms Water vapor Liquid containing amino acids and other organic compounds Cold water cools chamber, causing droplets to form.

[object Object],Abiotic “stew” of inorganic matter Simple organic molecules RNA nucleotides RNA able to replicate itself, synthesize proteins, and function in information storage DNA functions in information storage and retrieval RNA helps in protein synthesis Proteins build cell structures and catalyze chemical reactions

Origin of Eukaryotic Cells ,[object Object],Mitochondrion Aerobic bacteria Nuclear envelope evolving Ancient Prokaryotes Plants and plantlike protists Primitive Photosynthetic Eukaryote Primitive Aerobic Eukaryote Ancient Anaerobic Prokaryote Chloroplast Animals, fungi, and non-plantlike protists Photosynthetic bacteria

Origin of Eukaryotic Cells Ancient Anaerobic Prokaryote Nuclear envelope evolving Aerobic bacteria Ancient Prokaryotes

[object Object],Mitochondrion Primitive Aerobic Eukaryote

Primitive Photosynthetic Eukaryote Chloroplast Photosynthetic bacteria Prokaryotes that carried out photosynthesis evolved into chloroplasts.

17-3 Evolution of Multicellular Life

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Paleozoic Era ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Paleozoic Era ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],Paleozoic Era

[object Object],[object Object],Paleozoic Era

Paleozoic Era ,[object Object],[object Object],[object Object],[object Object],[object Object]

Paleozoic Era ,[object Object],[object Object]

Mesozoic Era ,[object Object],[object Object]

Mesozoic Era ,[object Object],[object Object],[object Object]

Mesozoic Era ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],Cenozoic Era

Cenozoic Era ,[object Object],[object Object],[object Object],[object Object],[object Object]

Cenozoic Era ,[object Object],[object Object],[object Object]

Extinction ,[object Object],[object Object],[object Object]

[object Object],Artiodactyls Cetaceans Perissodactyls Tubulidentates Hyracoids Sirenians Proboscideans Ancestral Mammals

Punctuated equilibrium is a pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change.

[object Object],Ancient Insect Two Types of Modern Insects

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Bio17 The History of Life

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