when someone studied the hydra a member of an ancient group of sea creatures was still flourishing. Some researchers at UC Santa Barbara made a discovery about the human vision. They found that hydra are simple animals that belong to the phylum cnidaria like jellyfish. Cnidarians were first here 600 million years. They determined the genetic gateway aka ion channel, in the hydra is involved in light sensitivity. said. "This is the same gateway that is used in human vision" Todd H. Oakley replied.
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