Podcast
Questions and Answers
What effect did volcanic activity have on the global climate?
What effect did volcanic activity have on the global climate?
Which of the following is a consequence of global cooling during ice ages?
Which of the following is a consequence of global cooling during ice ages?
What is a significant impact of human over-harvesting on animal populations?
What is a significant impact of human over-harvesting on animal populations?
What impact does acid precipitation have on ecosystems?
What impact does acid precipitation have on ecosystems?
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How does the removal of natural habitats by humans affect animal species?
How does the removal of natural habitats by humans affect animal species?
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What characterizes the extinction of a species?
What characterizes the extinction of a species?
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Which of the following best explains the relationship between genetic variation and species survival?
Which of the following best explains the relationship between genetic variation and species survival?
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What is a characteristic of man-made factors contributing to extinction?
What is a characteristic of man-made factors contributing to extinction?
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Which of the following statements about extinction types is correct?
Which of the following statements about extinction types is correct?
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Which animal is identified as critically endangered and endemic to the Philippines?
Which animal is identified as critically endangered and endemic to the Philippines?
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Study Notes
Biodiversity Loss
- Extinction marks the permanent loss of a species; no living members remain.
- Most species that have existed on Earth are now extinct.
- Habitat loss leads to severe consequences for species dependent on those environments.
- Genetic variation within species is crucial for survival and adaptation; its loss adversely affects resilience.
Extinct Species in the Philippines
- Philippine Elephant (Elephas beyeri): A dwarf elephant species that once inhabited Cabarruyan Island, now extinct.
- Visayan Warty Pig (Sus cebifrons): Critically endangered, found on six Visayan Islands, known regionally as 'wild pig.'
- Philippine Forest Turtle (Siebenrockiella leytensis): Critically endangered freshwater turtle endemic to the Philippines, also known as Leyte pond turtle.
Extinction Types
- Natural Extinction: Occurs at a standard rate, predating human influence; clears paths for new life forms.
- Mass or Accelerated Extinction: Characterized by rapid species loss, primarily driven by human activities.
Factors Contributing to Extinction
- Natural Factors: Historical events that caused past extinctions, such as natural climate changes.
- Man-Made Factors: Recent extinctions largely due to human impact on environments.
Natural Factors of Extinction
- Volcanic Activity: Eruptions can alter global climate and ocean chemistry, leading to extinctions.
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Global Changes:
- Warming: Extreme temperatures cause habitat uninhabitability.
- Cooling (Ice Ages): Glaciation reduces sea levels and alters ecosystems.
- Landscape Shifts: Oxygen depletion in cooling waters can lead to mass extinctions.
- Asteroid Impact: Significant impacts can cause global climate shifts, as hypothesized for dinosaur extinction.
Man-Made Factors of Extinction
- Activities disrupting natural habitats risk numerous species' survival and threaten human biological resources.
- Deforestation: Cutting down rainforests removes shelter and food for wildlife.
- Habitat Removal: Urban expansion and agriculture leave animals without living spaces.
- Over-harvesting/Hunting: Species like the Carolina Parakeet disappeared due to hunting pressures, going extinct in the early 1920s.
Summary
- Biodiversity loss is a critical issue, showcasing both natural and anthropogenic factors in species extinction.
- Protecting genetic diversity and habitats is essential for maintaining healthy ecosystems and preventing further extinctions.
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Description
Explore the critical topic of biodiversity loss and extinction through this quiz. Learn about extinct species in the Philippines, the impact of habitat loss, and the types of extinction events. Test your knowledge on how genetic variation affects species survival and adaptation.
