Self-study
Rodents are small, gnawing mammals characterized by their chisel-like incisor teeth. ████████ ████ █████ ████████ ██████ ███████ ███ ███ ██████ ████████ ████ ██ ███ ██████████ ███████ ██ █████ ███████ ███ ████████
Summary
Rodents are small mammals with chisel-like incisors. Most individual mammals in North America are rodents. However, most mammal species in North America are not rodents.
Strongly Supported Conclusions
In North America, rodent species usually have more members than do other species of mammals.
9.
Which one of the following ██ ████ ████████ █████████ ██ ███ ███████████ ██████
a
Most species of █████ ████████ ███████ ████ ███████████ ███████ ██████
This answer is unsupported. Rodents have chisel-like incisors, but most North American mammal species are not rodents. And we don't know if any other mammal species have chisel-like incisors.
b
In North America, ██████ ███████ ████ ██ ████ ████ ██████████ ███████ ████ █████ ███████ ██ ███████ █████
This answer is strongly supported. In North America, most mammal species are not rodents, and yet most individual mammals in North America are rodents. The only way this is possible is if rodent species typically have more members.
c
Most species of ███████ ████ ████ ███████████ ███████ █████ ███ ██ █████ ██ █████ ████████
This answer is unsupported. The stimulus only discusses North American species, so it's impossible for us to make a comparison between species in North America and elsewhere in the world.
d
Of the mammal ███████ ██ █████ ████████ ███ ███ ████ ███ ████ ██████████ ███████ ██ █ ███████ ██ ███████
This answer is unsupported. We can only infer from the stimulus that rodent species in general have more members. There could still be a single non-rodent species with more members than any rodent species.
e
Most nonrodent mammal ███████ ███ ██ █████ ██ █████ ████████
This answer is unsupported. Like in (C), we don’t have any information from the stimulus about species outside of North America to make this comparison.