PrepTest 87, Section 3, Question 14
Guam has 40 times more spiders than nearby islands have. Biologists argue that this is a consequence of the accidental 1940s introduction into Guam of the brown tree snake, which by the 1980s had eliminated ten of twelve native bird species. The biologists attribute the spider population's increase to the loss of bird species, because many birds prey on spiders and some use spiderwebs in constructing nests.
Guam has 40 times more spiders than nearby islands have. Biologists argue that this is a consequence of the accidental 1940s introduction into Guam of the brown tree snake, which by the 1980s had eliminated ten of twelve native bird species. The biologists attribute the spider population's increase to the loss of bird species, because many birds prey on spiders and some use spiderwebs in constructing nests.
Guam has 40 times more spiders than nearby islands have. Biologists argue that this is a consequence of the accidental 1940s introduction into Guam of the brown tree snake, which by the 1980s had eliminated ten of twelve native bird species. The biologists attribute the spider population's increase to the loss of bird species, because many birds prey on spiders and some use spiderwebs in constructing nests.
Guam has 40 times more spiders than nearby islands have. Biologists argue that this is a consequence of the accidental 1940s introduction into Guam of the brown tree snake, which by the 1980s had eliminated ten of twelve native bird species. The biologists attribute the spider population's increase to the loss of bird species, because many birds prey on spiders and some use spiderwebs in constructing nests.
Which one of the following, if true, most strengthens the biologists' conclusion?
Birds compete with spiders for insect prey.
The biologists counted spiderwebs as a means of estimating the spider population.
Spiderwebs are more prevalent on Guam than on nearby islands.
The two bird species remaining on Guam have proliferated since the arrival of the brown tree snakes.
Brown tree snakes have proven difficult to eradicate on Guam.
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