Points 400 Submitting a text entry box or a file upload
Instructions for Exam 2:
This is a take-home test that is open note, slides, book, or any other outside resources you would like to
use. Please use full sentences and your own words. Do not copy information directly from the book,
notes, or any other source.
1. 1.(20 points) All life on Earth, in order to survive, has to process chemicals through its life support
systems. Please discuss the following topics in the paragraph below: What are the three main
categories of life? What are the two chemical pathways that food is processed through? What are
the categories for the ecological pyramid, starting at the base or bottom? What happens to energy as
you move up the ecological pyramid?
2. 2.(10 points) We discussed two extinction events from Earth’s past: the *Last Ice Age and the
Permian extinction event. Discuss in detail the theories of what may have led to each of these two
different extinction events. *Be sure to include two examples of mammals that existed during the Last
Ice Age and how they fit into the ecological pyramid.
3. 3.(20 points) The Earth has about six critical biogeochemical cycles. We have examined two of them,
the carbon and sulfur cycle. Please discuss in detail all three parts of both the carbon cycle and the
sulfur cycle. How is climate affected by the carbon cycle? How is climate affected by the sulfur cycle?
4. 4.(20 points) Human population has been growing exponentially though time and different types of
resources are used depending upon where you live. Answer the following questions: How many
people are on Earth today? What can a population pyramid tell us about a nation? Why will
populations continue to rise in developing nations even if the growth rate has slowed down? Explain
the 4 stages of historical pattern of growth? Identify what stage developing nations and developed
nations are in?
5. 5.(20 points) Energy today is produced from both non-renewable and renewable sources. Address
the issue of why we should move away from non-renewable resources (be sure to include an
example of a non-renewable resource, how much of the resource is left, and its impacts on the
environment). Counter that argument with two examples of renewable resources as an alternative
(why would you choose those renewable resources? do you see any drawbacks to the renewable
resources you picked?
6. 6.(10 points) Deforestation has been on the rise globally. Name three reasons for deforestation in
tropical regions today. What are three important roles that forest play on Earth?
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