Reading Comprehension: Detail Function Questions

The author uses the word though most probably to emphasize that

Incorrect.

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This answer choice incorrectly creates a relationship of cause and effect (rather than one of opposition) between the cooling climate and the remaining flora.

Excellent!

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The word though indicates that flora survived despite the cooling of the weather. The author uses this word in order to show although we might have expected life forms to suffer and dwindle due to the lower temperatures, some nevertheless remained alive.

Incorrect.

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This answer choice incorrectly creates a relationship of cause and effect rather than one of opposition, claiming that the cooling climate is the reason that plant life survived.

Incorrect.

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This answer choice introduces detail that is not mentioned in the passage. Nowhere does the passage state that the flora's location was the sea floor. 

Notice the ways in which this answer choice misleads: it distorts the original meanings by connecting the sea floor with flora, whereas the passage only mentions the sea floor in connection to faune. Second, it changes the meaning of the word remained from a word pertaining to the survival of plant life, to a word pertaining to plant life maintaining its geographical position.

Incorrect.

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This answer choice incorrectly connects the movement of the supercontinent Gondwana with the survival of the flora, while in the passage the survival of the flora is connected with the cooling climate.

even the movement of the continent did not eradicate the local plantlife
despite the movement of the continent, plantlife remained on the sea floor and flourished in the tropical seas
the fact that the weather turned colder in Antarctica had helped plantlife survive
the decrease in temperature led to the loss of some, but not all, life forms
the cooling climate was a result of the remaining flora, which restricted continued warming

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