History of Life on Earth
Explore the major events and theories shaping the history of life on Earth, from early cells to complex organisms.
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History of Life on Earth
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Read each question carefully and answer to the best of your knowledge.
1. What is the approximate age of Earth?
1.5 billion years
4.5 billion years
10 billion years
500 million years
2. Which of the following gases was NOT abundant in Earth's early atmosphere?
Methane
Ammonia
Oxygen
Water vapor
3. The first forms of life on Earth were simple, single-celled organisms called .
4. The accumulation of free oxygen in the atmosphere, largely due to photosynthesis by cyanobacteria, is known as the Event.
5. All life on Earth evolved from a common ancestor.
True
False
6. Describe the Miller-Urey experiment and its significance to the origin of life.
7. Explain the endosymbiotic theory and provide evidence supporting it.
8. Number the following events in the history of life on Earth in chronological order (1 being the earliest):
Appearance of multicellular organisms
Formation of Earth
Great Oxidation Event
First prokaryotic cells
First eukaryotic cells
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