Self-study
Fishery officials are still considering options for eliminating Lake Davis's population of razor-toothed northern pike, a fierce game fish that could threaten salmon and trout populations if it slips into the adjoining river system. ███████████ █████████████ ████████ ███ ████████ ███ ████ ████ ████ █████ ████ ████ █████ ████ ██████ ███ █████ ██ ███ ████ ██ █████ ██ █████████ ███ █████ ████ ████████ █████ ██████████ ███████ ███ █████ ████████ ███████ ███ ██████ ███ ███ ████████ ███████ ███████ █████████
Summary
Fishery officials are still considering options to eliminate a breed of pike from Lake Davis. Introducing disease and draining the lake have been ruled-out as options. Four years ago, poison was added to the lake and caused an outrage among residents.
Strongly Supported Conclusions
The poison added to Lake Davis four years earlier must not have been successful in eliminating the pike.
10.
Which one of the following ██ ████ ████████ █████████ ██ ███ ███████████ ██████
a
Draining the lake █████ ███ █████ ███ ████████ ███████ ███████ ██ ███████
We know that draining the lake is not an option for eliminating the pike from Lake Davis, but we do not know why this option was ruled out by Fishery officials.
b
Four years ago ███ ███ ████ ████ ████ ██████ ███ ████ ███████ ███ ████ ██ ███ █████
We don’t know whether or not poison was introduced into Lake Davis only once in attempt to eliminate the pike.
c
The poison added ██ ███ ████ ████ █████ ███ ███ ███ ██████████ ██ ███████ ███ ████ ██ ███ █████
The poison added to Lake Davis must not have been successful in eliminating the pike, since Fishery officials are still considering options for the pike’s elimination.
d
Four years ago, ███████ █████████ ███ ███ ████████ ███ ███████ █████ ████ █████ ███████
We don’t know what options Fishery officials were considering four years ago in order to eliminate the pike from Lake Davis. We know that they eventually decided to use poison, but there could have been other options they were considering.
e
Salmon and trout ███████████ ██ ███ ████ █████ ████ ███ █████████ ██ ███ ████████ ████████
We know that the pike in Lake Davis threatens the lake’s population of salmon and trout, but we do not know if these two fish species are essential for the economy.