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The earth has undergone several glacial periods

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Certain flora are reliably associated with particular climatic conditions

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Fossils of whale species dating from between sixty million and fifty million years ago will not be found on continents that were at the time separated

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Fossils of whale species that drank fresh water will not be found in close proximity to fossils of whale species that drank salt water.

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The earliest whales that drank salt water differed from fresh-water-drinking whales only in their possession of specialized kidneys.

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Property values have for the most part dropped significantly; yet some have risen slightly.

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Property values have dropped significantly and uniformly.

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Among the entrepreneurs surveyed, those who did not produce formal business plans sought and received a much larger proportion of their capital from i

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The entrepreneurs surveyed who did not produce a formal business plan spent nearly as much time doing preparatory research and planning as the entrepr

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In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.

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In pursuing a moving insect, the beetles usually respond immediately to changes in the insect's direction, and pause equally frequently whether the ch

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The quantities of dissolved salts deposited by rivers in the Earth’s oceans have not been unusually large during the past hundred years

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None of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans

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The toys that used to come in cereal boxes were put together by the same children who played with them.

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Part of the pleasure of any toy lie in putting the toy together before playing with it.

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those states with the strictest environmental regulations invest the most in education and job training

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even those states with very weak environmental regulations have experienced at least some growth

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Has the circulation of the Greenville Times increased substantially in the last two years?

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Among all the types of industry and retailing that use the Greenville Times as an advertising vehicle, which type accounts for the largest proportion

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The average pay for jobs created in the city during the past three years was higher than the average pay for jobs created in the city earlier in Mayor

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The average pay for jobs eliminated in the city during Mayor Delmont's tenure has been roughly equal every year to the average pay for jobs citywide.

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Because the water hyacinth that manatees feed on grows best in water that is nearly still, water hyacinth beds can be disturbed or damaged by fast-mov

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When experimenters exposed manatees to the recorded sounds of boats moving at various speeds, the creatures were unable to discern the sounds over nor

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The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used

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All laboratory tests to detect pironoma have the same proportion of false negative results.

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The first acknowledges a consideration that weighs against the conclusion of the argument; the second is that conclusion.

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The first is a judgment advanced in support of the conclusion of the argument; the second is that conclusion.

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At least some foreign companies that conduct stem cell research work under fewer restrictions than some American companies do

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Because American scientists are under long-term contracts to foreign companies, there will be a significant influx of foreign professionals into the U

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Some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft.

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The naturally occurring fullerenes are arranged in a previously unknown crystalline structure.

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Shungite itself is formed only under distinctive conditions.

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The quantities of dissolved salts deposited by rivers in the Earth's oceans have not been unusually large during the past hundred years.

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None of the salts carried into the Earth's oceans by rivers are used up by biological activity in the oceans.

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The first provides support for the conclusion of the argument; the second identifi es the content of that conclusion.

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The first provides support for the conclusion of the argument; the second calls that conclusion into question.

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Each provides support for the conclusion of the argument.

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A number of trees from one of the species widespread in Thomasville 20 years ago reached the end of their natural life span in the intervening period.

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A city with a high proportion of any one species of trees can have its tree population devastated by one outbreak of a disease.

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When lawmakers establish income tax rates in order to generate a certain level of revenue, they do not allow adequately for revenue that will be lost

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Taxpayers do not differ from each other with respect to the rate of taxation that will cause them to evade taxes.

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computer owners in the United States predominantly belong to demographic groups that have long been known to spend less time watching television than

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many people use their computers primarily for tasks such as correspondence that can be done more rapidly on the computer, and doing so leaves more lei

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