Owls begin migrating to an area to feed on a particular mouse species, but the mice have ingested a toxin (to owls) that begins to keep the owl population in check, which then causes the mouse population to increase, until more owls move into the area, and so on. This is an example of a
A) positive feedback system.
B) negative feedback system.
C) detritivore.
D) chemosynthesis.
B) negative feedback system.
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Which of the following locations and conditions will likely have the largest diurnal temperature variation?
A) an island in subtropical latitudes with partly cloudy skies B) the top of an 8000-foot-high mountain in clear weather C) a city at 500 feet elevation with clear weather D) a plain at 1000 feet elevation with cloudy weather E) an equatorial jungle in the middle of Africa
We can calculate that a country would lower its arithmetic density by
A) increasing the amount of agricultural land. B) limiting the number of farmers. C) increasing the areas of its urban centers. D) limiting the size of its population. E) increasing the size of its population.
The population of Pakistan is primarily
A) Hindu B) Jain C) Sikh D) Muslim E) Christian
Which of the following protects itself with stinging needlelike cells called nematocysts?
A) Limpets B) Sea Anemones C) Sea stars D) Sea urchin E) Snails