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Amphibian populations are declining in numbers worldwide. ███ ███████████████ ███ ███████ █████ █████ ███ ████ ████████████ ████████ ██████████ ███ ████ ██ ██████ ███████████ █████ ██████ █████ █ ████ ██ ███████████ █████████ ████ ██ ████████████ ████████ ██ ███ ████ ███ █████ ███ ██████ ██████ ███████ ██████████ ████ █████ █████ ██ ████████ ██ ██████ █████ ████ ███ ████████████ ██████████ ██ ████ ██████████ ██ █████████ █████ ██████████ ████ ████ ███ ██████████ ██ ████████ ██ ████ ███████ █████ ███ ███████ █████ ██ ███ █████████ █████████ ██████████ ██ ███ █████████ ██ ███ █████ ██████
Summarize Argument: Phenomenon-Hypothesis
The author hypothesizes that the main cause of the declining amphibian population is the depletion of the ozone layer. This is based on the following facts. First, the ozone layer has been continuously depleted over the last 50 years. Second, ozone blocks UV-B, to which amphibians are vulnerable due to their lack of hair/hide/feathres and because their eggs lack leathery/hard shells.
Notable Assumptions
The author assumes there’s no more significant causal factor for the declining amphibian population than the declining ozone layer.
20.
Each of the following, if █████ █████ ██████████ ███ ████████ ███████
a
Of the various █████ ██ █████████ ███████ ██ ███████████ ██████ ████ ██ ███ ████ ████ ████ ███ ██████ ██████
b
Amphibian populations are █████████ ███ ████ ███████ ████ ███ ███ ███████████ ██ ████████████ ███████ █████ ███████ ███ ████ ████ ████ ███████ ██████████ ████ █████
c
Atmospheric ozone has ████ █████████████ ████████ █████ ███ ███ █████ ██ ███ █████ ██ █████ █████████ ███████████ ███ ██████████
d
The natural habitat ██ ██████████ ███ ███ ██████ ███████ ████ ███ ████ ████████
e
Amphibian populations have ████████ ████████████ ███ ███ ████ ██ ██████