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Part I: Cascades

1. What does the term "analogue" mean as used in Part I: Cascades?
(a) A thing that can be computed numerically.
(b) A thing seen as comparable to another.
(c) A think that is unlikely.
(d) A thing that is uncertain.

2. How many mass extinctions has the earth experienced prior to the one we are living through now, according to the author in Part I: Cascades?
(a) 5.
(b) 4.
(c) 3.
(d) 2.

3. The author states in Part I: Cascades that all mass extinctions aside from the one that killed off the dinosaurs were caused by what?
(a) Climate change produced by heat storms on the sun.
(b) Asteroids.
(c) Climate change produced by greenhouse gas.
(d) Extraterrestrial intervention.

4. The rate at which humankind is adding carbon dioxide into the atmosphere is how many times faster than any point in human history before the beginning of industrialization?
(a) 10 times faster.
(b) 20 times faster.
(c) 4 times faster.
(d) 7 times faster.

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