One hundred thousand years ago a population of rodent species migrated into a new environment and experienced little competition for resources. Today, this species is still surviving in this environment, but competition from other species has decreased its choices for food and has limited the species to a smaller home range. When the species first migrated into this new environment it filled its
_________________ niche, whereas, 100,000 years later it experienced its ____________ niche.
a. realized; fundamental
b. fundamental; realized
c. intrinsic; realized
d. extrinsic; fundamental
e. intrinsic; extrinsic
B; With little competition the species could fill its fundamental niche which is broader than its realized niche. With increased competition from other species the fundamental niche was narrowed and the species filled its realized niche.
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Which structure in the accompanying figure is responsible for allowing entire regions of cells to respond to a single stimulus?
A. A B. B C. C D. D E. E
In which species would parthenogenesis be most likely to evolve as a reproductive strategy?
What will be an ideal response?
Even though nitrogen constitutes 78% of Earth's atmosphere, the amount available for living things nearly all comes from
A. a few groups of nitrogen-fixing bacteria. B. the breakdown of minerals. C. a few genera of detritivores. D. nitrogen-containing fertilizers. E. the breakdown of dead plants.
Which of the following is not a hypothesis for the origin of viruses?
a. Viruses are escaped selfish genetic elements. b. Viruses are the remnants of parasitic cellular organisms selected for a reduction in size. c. Viruses are relics of the RNA world. d. Viruses are escaped genes from modern genetic engineering experiments.