Self-study
Passage A.
P1
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Conservationists' old view ·
Introducing non-native species to a habitat is only a problem for disturbed habitats
Conservationists' (and author's) current view ·
Non-native species are a threat to even healthy habitats
P2
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Example 1 ·
Non-native Melaleuca trees are damaging the habitat in Everglades Park in Florida
The trees grow tall and outcompete some native plants for sunlight. Also, leaf litter from trees impedes water flow, which hurts native plants.
Example 2 ·
Non-native Scotch broom plants in Australia have harmed native reptiles
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P3
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Author's perspective ·
Non-native species don't actually harm nature
They threaten our ideas of what "nature" is supposed to be. Biodiversity in an area often goes up when non-native species are introduced.
P4
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Elaboration ·
Non-native species do change an ecosystem, but that's not necessarily bad
Contrast change in an ecosystem with destruction of an ecosystem. Destruction is bad. But change may not be bad.
P5
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Concession and elaboration ·
A few species do cause damage and destroy other species, but most don't
Most non-native species will simply change nature, not destroy it.
Passage Style
15.
Both passages are concerned with █████████ █████ ███ ██ ███ █████████ ██████████
Question Type
Stated
The primary purpose of each passage is to discuss the effects of introducing nonindigenous species into ecosystems. Passage A views the effects as negative. Passage B, however, doesn’t view the effects as generally negative.
a
Why are some ██████████ ████ ██████████ ██ ██████████ ███████ ████ ███████
Neither passage explores why some ecosystems are more vulnerable than others. Passage A mentions that people used to think that disturbed habitats are more vulnerable than healthy ones, but now that belief is no longer held.
b
What distinguishes introduced ███████ ████ ███ ███████ ████ █████ ████ ███ █████████
Neither passage discusses why some nonindigenous species are more harmful than other nonindigenous species.
c
What approach should ██ █████ ██ ███████ ██████████ ████ ██████████ ████████
Neither passage discusses how ecosystems should be protected by nonindigenous species.
d
How are ecosystems ████████ ██ ███ ████████████ ██ ███ ████████
This best captures the primary purpose of each passage, which is to discuss the effects of introducing nonindigenous species into ecosystems. Passage A views the effects as negative. Passage B, however, doesn’t view the effects as generally negative.
e
How are species ████ ██ ██████ ██████ █████ ██████ ███████████
Neither passage discusses how species are able to go beyond their native ecosystems.