Revise later
SpaceTo flip
If confident
All Flashcards
What are the differences between speciation and extinction?
Speciation: Formation of new species | Extinction: Loss of existing species
How does ecological stress differ from natural selection?
Ecological stress: Environmental changes causing harm | Natural selection: Adaptation over generations.
Compare the causes of the Permian-Triassic and Cretaceous-Paleogene extinctions.
Permian-Triassic: Volcanic eruptions, ocean chemistry changes | Cretaceous-Paleogene: Asteroid impact.
What is the difference between natural and human-caused extinctions?
Natural: Caused by natural disasters/climate shifts. | Human-caused: Driven by habitat destruction, pollution, etc.
Compare the effects of high speciation rates versus high extinction rates on biodiversity.
High speciation: Increases diversity | High extinction: Decreases diversity
What is the effect of massive volcanic eruptions during the Permian-Triassic period?
The loss of over 90% of species.
What was the effect of the asteroid impact during the Cretaceous-Paleogene extinction?
Extinction of dinosaurs and many other species.
What is the effect of deforestation on extinction rates?
Increased extinction rates due to habitat loss.
What is the effect of climate change on species?
Ecological stress, habitat loss, and increased extinction rates.
What happens when a species goes extinct?
Its niche becomes available for other species.
What is the definition of extinction?
The termination of a species.
Define ecological stress.
Environmental changes that make it difficult for species to survive.
What is speciation?
The formation of new species.
Define biodiversity.
Determined by the balance between speciation and extinction rates.
What is a niche?
The specific role or function of a species within an ecosystem.