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Questions and Answers
What is the primary significance of the Cambrian Explosion in the history of life?
What is the primary significance of the Cambrian Explosion in the history of life?
- It was a period of rapid extinction due to volcanic eruptions.
- It marked the beginning of life on Earth.
- It signified the transition from aquatic life to terrestrial life.
- It witnessed the development of the first complex multicellular organisms. (correct)
What significant role did cyanobacteria play in the evolution of life on Earth?
What significant role did cyanobacteria play in the evolution of life on Earth?
- They formed the basis of the first food chains, supporting predator-prey relationships.
- They were the first organisms to evolve complex multicellular structures.
- They provided the first evidence of fossils, indicating past life.
- They introduced the first form of photosynthesis, releasing oxygen into the atmosphere. (correct)
What do transitional fossils demonstrate?
What do transitional fossils demonstrate?
- The specific environmental conditions that led to the development of a particular species.
- The gradual changes and adaptations that occur during evolution. (correct)
- The complete evolutionary history of a single species.
- The existence of extinct species that have no modern counterparts.
What is the primary purpose of radiometric dating?
What is the primary purpose of radiometric dating?
What is the likely consequence of the emergence of predators on the evolution of prey species?
What is the likely consequence of the emergence of predators on the evolution of prey species?
Flashcards
Cyanobacteria
Cyanobacteria
Single-celled organisms responsible for producing oxygen through photosynthesis.
Transitional fossils
Transitional fossils
Fossils that exhibit traits from both ancestral and descendant species.
Cambrian Explosion
Cambrian Explosion
A rapid diversification of life that occurred during the Cambrian period.
Radiometric dating
Radiometric dating
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Adaptations
Adaptations
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Study Notes
Lesson 2 - Science Review
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Cyanobacteria: Single-celled organisms that use photosynthesis to create food. They produced an oxygen-rich atmosphere on ancient Earth.
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Oxygen-Rich Atmosphere: Early Earth's atmosphere was transformed by cyanobacteria, producing an oxygen-rich environment.
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Igneous Rock Layers: Dating methods like radiometric dating can be applied to determine the age of igneous rock layers, providing information tied to ancient life.
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Cambrian Explosion: A period of significant diversification of life forms, characterized by the sudden appearance of many new species.
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Transitional Fossils: Fossils that exhibit traits of both ancestral and descendant species, showing evolutionary changes.
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Evolutionary Adaptations: Organisms adapt to their surroundings, including adapting to and responses to predators.
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Predators and Prey: Predators are organisms that hunt and kill other organisms for food, while prey are the organisms that are hunted. The evolution of predators can lead to new adaptations and diversity in the prey population.
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Fossil Evidence: Fossils reveal changes and characteristics over time. Transitional fossils show evolutionary links.
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Body Structures: Fossils reveal body structures in ancestral species and traits.
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Amphibians, Reptiles, and Mammals: Common features, like bones in their fins, can be seen in transitional fossils like Tiktaalik, showing evolutionary paths.
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Later Rock Layers: Later rock layers frequently include various fossils, including those of amphibians, reptiles, ancient birds and mammals, revealing life's progression over time.
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