Does this experiment support the conclusion that prairie dogs are a keystone species?
a. Yes, because once they recovered other populations declined.
b. Yes, because they tracked the recovery of grasses and forbs.
c. Yes, because once prairie dogs recovered other population levels tracked their recovery.
d. No, the experiment refutes the conclusion that prairie dogs are a keystone species.
c
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Octopuses and squid have a closed circulatory system with _______ heart(s).
a. one b. two c. three d. eight
Scanning electron microscopy is most often used to reveal
A. surface structures. B. internal structures. C. both surface and internal structures simultaneously. D. either surface or internal structures, but not simultaneously.
What is the correct order of geological time frames from oldest to most recent?
a. Permian - Triassic - Jurassic - Tertiary
b. Triassic - Jurassic - Tertiary - Permian.
c. Triassic - Permian - Jurassic - Tertiary.
d. Tertiary - Triassic - Permian - Jurassic.
e. Jurassic - Triassic - Permian - Tertiary
The statement "The virulence of many pathogens in humans may not be a target of selection itself, but rather an accidental by-product of selection on other traits" describes ________
A) the coincidental evolution hypothesis B) the shortsighted evolution hypothesis C) the trade-off hypothesis D) the energy-balance hypothesis