Biology questions

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Biology questions

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True or false: Nearly all developed countries in the world are beginning a demographic transition in the 21st century. 
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True or false: Human population growth has always been exponential. 
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True or false: Most developed countries have passed through a demographic transition and currently have low population growth rates. 
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True or false: A population can be clumped at one scale and uniform at another. 
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Developed countries are characterized by 
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True or false: The carrying capacity of a given geographic region for a single population can change over time. 
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True or false: The human population may continue to increase even though it surpasses carrying capacity. 
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Approximately 200 of the 300 native species of fish in Lake Victoria haven’t been observed since the 1960s and are therefore probably extinct. Using the estimate of the background extinction rate, how many species of Lake Victoria fish would one expect to have naturally become extinct during the last 50 years? 
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Global climate change is likely to increase the rate of extinction worldwide. The pollutant most implicated in this problem is 
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In order to be considered extinct, a species can’t be found 
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Over the past 580 million years, biodiversity has 
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The runoff of fertilizers from agricultural and residential areas can cause the aquatic algae in bodies of water to grow prolifically, resulting in a phenomenon called 
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The sudden loss of a ________ would necessarily cause the loss of most or all of a food web. 
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Cattle egrets hitch a ride on domestic cows and eat insects that are stirred up by their activity. This is an example of 
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Teosinte is a wild grass in Mexico from which corn (maize) was originally domesticated. Corn that is grown commercially is probably 
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During the 19th century, sea otters were hunted almost to the point of extinction. When the number of sea otters became very low, it was noticed that the ecosystem of kelp bed “forests” was also disappearing. It was discovered that the sea otters were predators of sea urchins, which were, in turn, predators of the kelp. When sea otters declined, the sea urchin populations grew, destroying the kelp ecosystem and the many species that depended on it. It was then understood that sea otters were ________ in this ecosystem. 
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Is a species that has few individuals at greater risk of extinction than a species with a large population size? Why or why not? 
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Earth’s axis is tilted away from the sun during ________ and toward the sun during ________ in the Northern Hemisphere. 
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The temperature of a city is often warmer than the temperature in its surrounding suburbs. This is the result of an urban heat island effect. What is one reason why this effect occurs? 
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The dry deserts of Nevada are most influenced by 
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France is at almost the same latitude as Nova Scotia. Why is France’s climate so much milder? 
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The amount of light received by a given unit area over time is called 
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Regions that have ________ levels of solar irradiance have ________ average temperatures. 
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Hypothetically, scientists could lower Earth’s temperature by ________, in order to combat global warming. 
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Treatment of wastewater in industrial plants of developed countries includes 
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