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Research by Jennifer A. Clack and her colleagues confirmed that the very earliest tetrapods, animals similar to Acanthostega, were wholly aquatic and very unsuited to existence on land. World Professional Billiards and Snooker Association.

Research by Jennifer A. Clack and her colleagues confirmed that the very earliest tetrapods, animals similar to Acanthostega, were wholly aquatic and very unsuited to existence on land. World Professional Billiards and Snooker Association.