All life of course at this time is in the ocean. There's things that look like ferns, and are attached to the sea floor. But they lived at such a depth that t

All life of course at this time is in the ocean. There's things that look like ferns, and are attached to the sea floor. But they lived at such a depth that the sunlight would not have been able to reach them so they could not have been plants. https://en.wikipedia.org/wiki/Charnia https://en.wikipedia.org/wiki/Charnia "The living organism grew on the sea floor and is believed to have fed on nutrients in the water. Despite Charnia's fern-like appearance, it is not a photosynthetic plant or alga because the nature of the fossilbeds where specimens have been found implies that it originally lived in deep water, well below the photic zone where photosynthesis can occur. "