A student reads a passage about desert ecosystems in Arizona. The author states that saguaro cacti can live over 150 years and grow arms only after reaching about 75 years of age. What is the PRIMARY purpose of this information in the passage?
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A
To entertain readers with unusual desert facts
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B
To support the central idea that desert plants have remarkable survival adaptations
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C
To argue that Arizona deserts are more interesting than other ecosystems
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D
To explain why saguaro cacti are endangered