Our understanding of when the very first animals started living on land is helped by identifying trace fossils -- the tracks and trails left by ancient animals -- in sedimentary rocks that were deposited on the continents.
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2018/12/181213131251.htm
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2018/12/181213131251.htm
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