29 Jul HOW DID MASS EXTINCTIONS IN THE PAST HELP BRING ABOUT THE SPECIES THAT WE KNOW TODAY ON EARTH?
What is a mass extinction? How did mass extinctions in the past help bring about the
species that we know today on Earth?
2.Describe how each of the following factors could lead to a mass extinction: glaciers,
volcanoes, asteroids, supercontinent formation, climate change.
3.What types of organisms were eliminated in each of the following mass extinctions:
Ordovician, Permian, Cretaceous
Ecology and Human Influences on other Species4.What is an ecological niche? Is it common to find two species occupying the same ecological niche in a functioning ecosystem? What happens when two species occupy
overlapping niches?
5.What is the difference between primary and secondary succession? Describe examples
of each.
6.List some different types of disturbances. 7.What are the characteristics of pioneer species, and when do we see them in ecological
succession?
8.What is a climax community? How are mid- and late-successional species different from
pioneer species?
9.Do primary and secondary succession in one location lead to the same climax
community? Why or why not?
10. Which is more resilient to disturbance: an ecosystem with a smaller number of species,
or an ecosystem with a larger number of species? Explain why.
11. What is biodiversity? How does it arise and what factors maintain it in an environment? Why is an environment with more biodiversity healthier than one with less biodiversity? 12. Describe examples and impacts of the following human influences on other organisms and ecosystems: human population growth, habitat destruction, habitat fragmentation, use of fossil fuels, release of pollutants, moving other species to new locations.
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