CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Fossilized pollen grains, computer artwork. Pollen grains are reproductive structures produced by flowers. It is rare, but not impossible, for soft structures to be fossilized. Fossils are where an organic object has left a shape in rock, usually formed from soft mud that preserved the shape of the original object. Flowering plants only evolved about 135 million years ago.
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