Natural selection acts on ________, and ________ evolve.
A. individuals; populations
B. populations; individuals
C. individuals; individuals
D. populations; populations
Answer: A
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Which of the following is a feature of eudicots, but not of monocots?
A. parallel venation B. leaf blade C. netted venation D. nodes E. internodes
Which of the following is not a helminth that causes intestinal symptoms accompanied by migratory symptoms?
A. Trichuris trichiura B. Ascaris lumbricoides C. Necator americanus D. Toxocara
Hagfish (Eptatretus cirrhauts) are a jawless marine vertebrate that are isotonic with their environment and are considered to be osmoconformers. How might this interesting adaptation limit the habitat that the hagfish can tolerate?
A) Hagfish are not limited by salinity. B) Osmoconformers do not face the same pressures as osmoregulators and can live in any marine environment. C) Individual hagfish will adapt to different salinities over their lifetime and, therefore, can inhabit any marine environment. D) Hagfish habitat is limited by the salinity of the environment.
You are conducting an experiment to determine what concentration of disinfectant is most effective in killing bacteria. In this example, the concentration of disinfectant would represent the
(a). control. (b). experimental variable. (c). response variable. (d). data. (e). hypothesis.