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What observation did Thomas Henry Huxley make about sea squirt larvae?

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Huxley, Thomas Henry — Thomas Henry Huxley Thomas Henry Huxley.

During his voyage on HMS Rattlesnake, the British biologist Thomas Henry Huxley observed that the larval sea squirt possesses tail muscles similar to those of a tadpole. This significant observation later contributed to the scientific understanding that sea squirts, or ascidians, are related to the ancestors of vertebrates.1