ocr: What do you mean?' Well, - it's probable that life on this planet started in the oceans, and that marine creatures migrated on to the land in search of new habitats. There's one fish that existed about 350 million years ago which was very like a mudskipper. It came up on to - the land using its fins as crutches. It's possible that it was the ancestor of all land-living vertebrates.
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