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A Brief History of Life
How Did Everything Begin?
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Intelligent Design Theories(Creation Myths)
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More Stories from Around the World…
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…on how the world began…
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…all of them unique
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If the earth has existed for 4.5 billion years,
what about life on earth? • Earliest evidence:
cyanobacteria called stromatolites (3.4 billion years), in Australia
• As early as 3.8 billion years ago
• Earth was stable enough to support life
• Ribonucleic Acid (RNA)
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But where?
• Possibly the ocean, based on evidences
• Fossils• Deep sea microbes• Smoker fossils in
China
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From single-celled organisms to complex creatures…
Evolution
Natural selection- helpful traits vs. harmful traits
Adaptation- best suited for environment
Genetic drift- independent process that produces random changes; chance
Diversification in nature
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Cambrian Explosion
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The Descent of Man and the Attacks on Evolution
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The Human Story
• Cenozoic Era (“Age of Mammals”)
• Around 2.5 million years ago
• African Savanna– Mammals including primates
• Humans and chimpanzees share a common ancestor between 7 to 6 million years ago
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If they are happy swinging in trees, why come down?
• Evidences found in the Great Rift Valley, savannas on the Eastern part of Africa– Difficulty in knuckle walking → adapt to
bipedalism– Predators abound → flight or fight, shelter and
protect– Scattered plants → change in diet, enriched
food selection
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“The Southern Ape”
• Australopithecus• 5 to 1 million years
ago• Characteristics similar
to humans and apes• Comparable brain
size with a chimpanzee
• A. afarensis →
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Pero murampa na ni siya…
• Bipedal; hands like humans
• A. africanus
• Lucy in the Sky with Diamonds
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Mr. Handy Man
• Homo habilis• 2.5 to 1.5 million
years ago• opposable thumbs-
efficient means of handling things and creating tools
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The Original Laagan
• Homo erectus• 1.6 million years to
200,000 years ago• Bigger brains, taller• ← Peking Man
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Taller, Smarter, Wiser
• Homo sapiens• Neanderthals• Cro-magnon
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Wisest of them all?
• Homo sapiens sapiens
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