Podcast
Questions and Answers
Which group of organisms was the main life-form during most of Earth's early history?
Which group of organisms was the main life-form during most of Earth's early history?
- Algae and bacteria (correct)
- Land plants and fish
- Complex organisms
- Humans
When did humans first appear on Earth based on the information provided?
When did humans first appear on Earth based on the information provided?
- 550 million years ago
- 200,000 years ago (correct)
- 500 million years ago
- 3.5 billion years ago
What is a mass extinction?
What is a mass extinction?
- When a new species evolves
- The permanent dying out of a species or a larger group of organisms (correct)
- When Earth formed
- When large numbers of species adapt to new environments
Which geologic time unit is the longest?
Which geologic time unit is the longest?
What marks the beginning of the Phanerozoic eon?
What marks the beginning of the Phanerozoic eon?
What event could potentially cause a mass extinction, such as the one that led to the extinction of dinosaurs?
What event could potentially cause a mass extinction, such as the one that led to the extinction of dinosaurs?
What division of geologic time comes after the Proterozoic Eon?
What division of geologic time comes after the Proterozoic Eon?
Which era is considered the oldest in the Phanerozoic Eon?
Which era is considered the oldest in the Phanerozoic Eon?
What major event marks the beginning of the Cambrian period within the Paleozoic era?
What major event marks the beginning of the Cambrian period within the Paleozoic era?
Why do scientists have more knowledge about the Cenozoic era compared to earlier periods?
Why do scientists have more knowledge about the Cenozoic era compared to earlier periods?
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