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Questions and Answers
What is a key characteristic of animals according to the text?
What is a key characteristic of animals according to the text?
- Autotrophic and single-celled
- Non-motile and lacking sensory organs
- Asexual reproduction and simple cell structures
- Mulitcellularity and complex cell structures (correct)
When did animals evolve from single-celled ancestors?
When did animals evolve from single-celled ancestors?
- Over 200 million years ago during the Cretaceous period
- Over 600 million years ago during the Ediacaran and Cambrian periods (correct)
- Over 800 million years ago during the Precambrian era
- Over 400 million years ago during the Jurassic period
What major event led to the rapid diversification of animal life during the Cambrian explosion?
What major event led to the rapid diversification of animal life during the Cambrian explosion?
- Volcanic Eruption
- Mass Extinction (correct)
- Ice Age
- Global Warming
What is a significant transition in animal evolution mentioned in the text?
What is a significant transition in animal evolution mentioned in the text?
What characteristic evolved, leading to bilateral symmetry?
What characteristic evolved, leading to bilateral symmetry?
What is a defining characteristic of animals according to the text?
What is a defining characteristic of animals according to the text?
What was a significant transition in animal evolution mentioned in the text?
What was a significant transition in animal evolution mentioned in the text?
What event led to the rapid diversification of animal life during the Cambrian explosion?
What event led to the rapid diversification of animal life during the Cambrian explosion?
What type of reproduction is characteristic of animals according to the text?
What type of reproduction is characteristic of animals according to the text?
What confirmed many conclusions about the origins of animals?
What confirmed many conclusions about the origins of animals?
Flashcards
Animal characteristic
Animal characteristic
Animals are multicellular with complex cell structures.
Animal evolution start
Animal evolution start
Animals evolved from single-celled organisms over 600 million years ago.
Cambrian explosion cause
Cambrian explosion cause
A mass extinction event triggered the Cambrian explosion, a rapid diversification of life.
Animal evolution transition
Animal evolution transition
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Bilateral symmetry cause
Bilateral symmetry cause
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Defining animal feature
Defining animal feature
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Key animal transition
Key animal transition
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Cambrian explosion driver
Cambrian explosion driver
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Animal Reproduction
Animal Reproduction
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Molecular evidence
Molecular evidence
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Study Notes
Animal Evolution
- Animals are multicellular, heterotrophic eukaryotes.
- Animals evolved from single-celled ancestors about 700 million years ago.
- During the Cambrian Explosion, a significant increase in oxygen levels in the oceans led to the rapid diversification of animal life.
- A significant transition in animal evolution was the development of bilateral symmetry, which allowed for the specialization of body parts and the development of a head.
- The evolution of a head with sensory organs allowed for the development of a central nervous system in many animals.
- Animals are heterotrophic, meaning they must obtain their nutrients from other organisms.
- A significant transition in animal evolution was the development of bilateral symmetry.
- The development of a head with sensory organs and the Cambrian explosion contributed to rapid diversification.
- Most animals reproduce sexually.
Animal Origins
- Recent fossil discoveries and DNA sequence analysis confirmed many conclusions about the origins of animals.
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