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प्रश्न
Approximately how long ago did invertebrates exist in aquatic environments?
पर्याय
200 mya
2000 mya
350 mya
500 mya
MCQ
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उत्तर
Invertebrates were present around 500 mya. They represent an important stage in early aquatic life before the evolution of vertebrates, including the later development of jawless and jawed fishes.
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