BIO 182 ASU Final Exam – All Verified Questions & Answers (100% Accurate)
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Course
BIO 182
Institution
BIO 182
BIO 182 ASU Final Exam – All Verified Questions & Answers (100% Accurate)
BIO 182 ASU Final Exam – All Verified Questions & Answers (100% Accurate)
What is extinction? - ANSWER - The loss or death of a species
What is mass extinction? - ANSWER - A decline in biodiversity greater than the...
, BIO 182 ASU Final Exam – All Verified
Questions & Answers (100% Accurate)
What is extinction? - ANSWER - The loss or death of a species
What is mass extinction? - ANSWER - A decline in biodiversity greater than the
background extinction rate
What is background extinction? - ANSWER - Background extinction occurs when
certain populations are reduced to zero because of normal environment change,
emerging disease, predation pressure, or competition with another species
How are mass extinctions detected and how many have been detected? - ANSWER
- They're detected geologically, and there have been 5 detected
What organisms became extinct during the Pleistocene and Cretaceous and what
are possible causes for these extinctions? - ANSWER - Pleistocene: Wooly
Mammoth, Giant Short-Faced Bear, Dire Wolf, Giant Beaver, Shasta Ground Sloth,
American Lion
-Could be extinct because of climate change (warmer temps), human overkill
(predation), pathogens
Cretaceous: Dinosaurs
-Could be extinct because of asteroid (impact hypothesis)
What is the evidence to support that there will be a 6th mass extinction? - ANSWER
- Modern rates of extinction are 100 to 1000 time greater than the background rate
What is overexploitation? - ANSWER - -Any unsustainable removal of wildlife from
the natural environment by use of humans
-Harvesting of organisms at rates exceeding the species ability to replace itself
-The dominant threat to marine species
-Overhunting
What is habitat destruction? - ANSWER - Terrestrial Ecosystems: Conversion
agriculture, logging, development and urbanization
Aquatic Ecosystems: Draining and developing wetlands, damming rivers
Species area curve - As the land area decreases, the number of species decreases
What is habitat fragmentation? - ANSWER - -The breakup of large pieces of natural
habitat into small, isolated pieces
-Can reduce a habitat to where it's too small to support a species
-Reduces the ability of individuals to disperse from one habitat to another (could be
more vulnerable to catastrophes)
-Creates a large amount of "edge" habitat (Edge effects light levels, pollution,
poachers, and competition)
-The species most impacted by this are those that require large territories to find
food
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