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1. Early Earth: A Planet Becoming Habitable

Course Introduction: Investigating Life's Origins

Earth Forms and Changes

Conditions That Supported Emerging Life

2. From Chemistry to the Building Blocks of Life

The Chemical Ingredients of Living Things

Energy Sources for Early Chemical Reactions

Why Liquid Water Was Essential

3. Possible Pathways from Molecules to Cells

Making Organic Molecules: Laboratory Evidence

The RNA World and Information Molecules

Protocells: Early Cell-Like Compartments

4. The Earliest Life and the Evidence Scientists Use

A Timeline of Earth's First Life

Fossils, Rocks, and Chemical Clues

What Scientists Know—and What Remains Unknown

Quiz

Question 1: Early Earth Conditions

Question 2: Building Blocks

Question 3: Early Energy

Question 4: Timeline of Life

Question 5: Evidence of Early Life

Survey and Feedback

Course Feedback Survey

Have you ever looked up at the stars or down at a microscopic fossil and wondered, "How did life on Earth actually begin. " Welcome to "How Life Began: The Emergence of Earth's First Organisms," a comprehensive online course designed to take you on a 4.

Have you ever looked up at the stars or down at a microscopic fossil and wondered, "How did life on Earth actually begin?" Welcome to "How Life Began: The Emergence of Earth's First Organisms," a comprehensive online course designed to take you on a 4.5-billion-year journey back to the dawn of our planet. This fascinating course explores the ultimate scientific mystery: how nonliving chemical matter transformed into the very first living cells. Throughout this immersive learning experience, you will investigate the extreme conditions of early Earth, from its fiery formation to the cooling oceans that became the cradle of life. We will dive deep into prebiotic chemistry, examining how essential building blocks like amino acids and RNA formed using energy from lightning, volcanic heat, and hydrothermal vents. You will explore groundbreaking laboratory evidence, including the famous Miller-Urey experiment, and unpack the RNA world hypothesis and the formation of protocells. Finally, you will learn how scientists decode ancient clues hidden in microfossils, stromatolites, and chemical signatures to construct a timeline of early life. Whether you are a science enthusiast, a student of biology, or simply curious about our origins, this course will equip you with a clear understanding of what science has discovered—and what profound questions remain unanswered. Join us to uncover the epic story of how Earth transformed from a barren, hostile rock into a vibrant, habitable world.

How Life Began: The Emergence of Earth's First Organisms

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            <p>The transition from a barren, volatile planet to a world teeming with life is one of the most profound mysteries in science. Approximately 4.5 billion years ago, Earth was a hostile environment characterized by intense volcanic activity, extreme temperatures, and an atmosphere vastly different from the oxygen-rich air we breathe today. Yet, within this chaotic setting, the foundational chemical building blocks of life began to assemble. This course investigates the central scientific question of how nonliving matter may have given rise to the very first organisms. By examining the environmental conditions of early Earth—such as the crucial presence of liquid water, reactive mineral surfaces, and diverse energy sources like lightning and geothermal heat—we can begin to understand the prebiotic chemistry that set the stage for biological evolution.</p>

<p>Tracing the pathway from simple chemical ingredients to complex, self-replicating cells requires a careful analysis of both laboratory evidence and geological clues. Throughout this course, we will explore how essential elements combined to form amino acids, nucleotides, and fatty acids, potentially leading to early information-carrying systems like the "RNA world" and the formation of primitive, membrane-bound compartments known as protocells. Furthermore, we will delve into the methods scientists use to uncover Earth's earliest biological history, from analyzing ancient microfossils and stromatolites to interpreting chemical signatures in rocks that are billions of years old. By distinguishing between established, evidence-based explanations and the questions that still remain unresolved, you will gain a comprehensive understanding of what we know—and what we are still discovering—about the origins of life on our planet.</p>
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