Exam1Spr15key - Bio20c Spring 2015 First Exam Name/SID...

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Bio20c Spring 2015 First Exam Name/SID Refer to this list of individuals when answering the questions that follow: Aristotle, Hutton, Lamarck, Linnaeus, Lyell, Malthus, Smith. Isle Royal is an island in Lake Superior near the US border with Canada. It has historically been home to both moose and wolves which prey on the moose. Moose in turn preferentially feed on young balsa fir trees. In the late 1800’s wolves were systematically eradicated from much of the continental US and totally removed from Isle Royale. The population of moose exploded to over 300 and balsa fir trees soon became virtually absent from the island. Moose began to starve and the population soon crashed to around 400 individuals. Which component of Darwin’s mechanism of natural selection does this example illustrate? (2)
Which individual in the list at the top of the page published ideas that most relate to the concept presented in the previous question? (2) MalthusIsle Royal, formed around a billion years ago as lava oozed from cracks in the crust and solidified to form volcanic rock. Slowly this rock was bent to form the basin of Lake Superior and Isle Royale was formed as one edge of the bent basin remained above the level of the water as the basin filled. It has since been repeatedly scored by glaciers that slowly eroded the rocks and deposit sediment and then retreat. A process that is ongoing today. What are two geologic concepts that can be recognized here and which name in the list above is best associated with these concepts? (4)
Concept 2: Deep Geologic time Name: Lyell Chambered nautilus and squid are both free swimming cephalopod mollusks that evolved from a common bottom living ancestral mollusk that possessed a protective shell. The figure on the right shows the progression of this transition. Modern nautilus retain their protective shell while in squid it has been reduced to a thin glass like strip called a gladius that is embedded in their body wall (black structures in the figure). What term would best describe the relationship between a nautilus shell and a squid gladius? (2)

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