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A Brief History of Life
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A Brief History of Life

A Brief History of Life

How Did Everything Begin?

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Intelligent Design Theories (Creation Myths)

Intelligent Design Theories (Creation Myths)

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More Stories from Around the World

More Stories from Around the World

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on how the world began

on how the world began

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all of them unique

all of them unique

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A Brief History of Life

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A Brief History of Life

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If the earth has existed for 4.5 billion years, what about life on earth?

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?

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

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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From single-celled organisms to complex creatures

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Cambrian Explosion

Cambrian Explosion

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The Descent of Man and the Attacks on Evolution

The Descent of Man and the Attacks on Evolution

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The Human Story

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

Slide 15

If they are happy swinging in trees, why come down?

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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