Why is the sea otter considered a keystone species in areas of the Pacific Ocean?
A) If sea otter populations were to crash, kelp forests could disappear because of overgrazing by sea urchins that would otherwise be controlled by the sea otters.
B) Sea otters eat barnacles and mussels, and if sea otter populations were to crash, barnacles and mussel populations in tide pools would expand, causing a decrease in biodiversity in those areas.
C) If sea otter populations were to crash, sea urchins would be unable to survive because kelp forests would become too dense.
D) Sea otters were introduced to control kelp and other invasive plants, and without them, the plants would grow too thick to support crab and lobster populations in the area.
A
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Relationships that express solidarity and connection, that assert closeness, and that serve as a basis for identity are captured in the concept of
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What sector of the service industry is most heavily regulated?
A) Finance B) Retail C) Restaurants D) Education E) Computer support
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A. would involve commitment of considerable land and material for large-scale use. B. is most practical for large industrial consumers. C. is not technologically possible at present. D. causes some pollution because toxic chemicals are released as the electricity is produced.