Bio 182 Final Exam Asu With Questions And
100% Correct Answers | Verified By Expert |
Brand New Update 2025.
Q: What is extinction?
A: The loss or death of a species. ✔✔
Q: What is mass extinction?
A: A decline in biodiversity greater than the background extinction rate. ✔✔
Q: What is background extinction?
A: When certain populations are reduced to zero due to normal environmental change, emerging
disease, predation, or competition with other species. ✔✔
Q: How are mass extinctions detected and how many have been detected?
A: Detected geologically, and there have been 5 detected. ✔✔
Q: What organisms became extinct during the Pleistocene and Cretaceous, and what are
possible causes?
A:
Pleistocene: Wooly Mammoth, Giant Short-Faced Bear, Dire Wolf, Giant Beaver, Shasta
Ground Sloth, American Lion
Causes: Climate change (warmer temps), human overkill (predation), pathogens
Cretaceous: Dinosaurs
Cause: Asteroid impact (impact hypothesis) ✔✔
Q: What is the evidence for a 6th mass extinction?
A: Modern extinction rates are 100 to 1000 times greater than the background rate. ✔✔
, Q: What is overexploitation?
A: Unsustainable removal of wildlife by humans, harvesting at rates exceeding species’ ability to
replace themselves, a dominant threat to marine species, overhunting. ✔✔
Q: What is habitat destruction?
A:
Terrestrial: Conversion to agriculture, logging, development, urbanization
Aquatic: Draining wetlands, damming rivers
Species-area curve shows species number decreases as land area decreases. ✔✔
Q: What is habitat fragmentation?
A: Breakup of large natural habitats into small isolated pieces, reducing habitat size and
dispersal ability, increasing edge effects harmful to species needing large territories. ✔✔
Q: How can exotic species contribute to extinction?
A: Introduction of new species can become invasive or carry pathogens. ✔✔
Q: What are phenology shifts?
A: Changes in timing of seasonal events related to climate change, causing mismatches between
organisms. ✔✔
Q: What are geographic range shifts?
A: Organisms move to climates they are adapted to; concern for arctic and alpine species
running out of habitat. ✔✔
Q: What are consequences of extinction?
A: Impacts ecosystem productivity, stability, disrupts mutualisms, and ecosystem services. ✔✔
Q: What is resource use efficiency?
A: Higher species diversity increases water use and photosynthesis. ✔✔
100% Correct Answers | Verified By Expert |
Brand New Update 2025.
Q: What is extinction?
A: The loss or death of a species. ✔✔
Q: What is mass extinction?
A: A decline in biodiversity greater than the background extinction rate. ✔✔
Q: What is background extinction?
A: When certain populations are reduced to zero due to normal environmental change, emerging
disease, predation, or competition with other species. ✔✔
Q: How are mass extinctions detected and how many have been detected?
A: Detected geologically, and there have been 5 detected. ✔✔
Q: What organisms became extinct during the Pleistocene and Cretaceous, and what are
possible causes?
A:
Pleistocene: Wooly Mammoth, Giant Short-Faced Bear, Dire Wolf, Giant Beaver, Shasta
Ground Sloth, American Lion
Causes: Climate change (warmer temps), human overkill (predation), pathogens
Cretaceous: Dinosaurs
Cause: Asteroid impact (impact hypothesis) ✔✔
Q: What is the evidence for a 6th mass extinction?
A: Modern extinction rates are 100 to 1000 times greater than the background rate. ✔✔
, Q: What is overexploitation?
A: Unsustainable removal of wildlife by humans, harvesting at rates exceeding species’ ability to
replace themselves, a dominant threat to marine species, overhunting. ✔✔
Q: What is habitat destruction?
A:
Terrestrial: Conversion to agriculture, logging, development, urbanization
Aquatic: Draining wetlands, damming rivers
Species-area curve shows species number decreases as land area decreases. ✔✔
Q: What is habitat fragmentation?
A: Breakup of large natural habitats into small isolated pieces, reducing habitat size and
dispersal ability, increasing edge effects harmful to species needing large territories. ✔✔
Q: How can exotic species contribute to extinction?
A: Introduction of new species can become invasive or carry pathogens. ✔✔
Q: What are phenology shifts?
A: Changes in timing of seasonal events related to climate change, causing mismatches between
organisms. ✔✔
Q: What are geographic range shifts?
A: Organisms move to climates they are adapted to; concern for arctic and alpine species
running out of habitat. ✔✔
Q: What are consequences of extinction?
A: Impacts ecosystem productivity, stability, disrupts mutualisms, and ecosystem services. ✔✔
Q: What is resource use efficiency?
A: Higher species diversity increases water use and photosynthesis. ✔✔
