But what about tracks of the moving animal? There are indeed some fossils from the White Sea.
One of the few features that are uncontroversial is the body size: The fossils measure usually 1-5 cm in length.
The fossilization of Kimberella specimens was most likely based on rapid burial with sand during storm events.
The metal element 42, molybdenum, is needed in the body in extremely small but vital amounts for enzymes to work properly.
If you tried to build a pipe that had to rotate on its long axis while maintaining its angular shape, could you do better than this?