Correct Answer - Option 4 : living
The correct answer is living.
- Let's look at the meanings of the given word and marked option:
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extinct- (of a species, family, or other groups of animals or plants) having no living members; no longer in existence
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living- remain alive
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Let's look at the meanings of the other given options:
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unknown- not known or familiar
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careless- not giving sufficient attention or thought to avoid harm or errors
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outside- the external side or surface of something
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Hence from the given meanings, we find that extinct and living are antonyms.