I want to know the answer to the following question:
Fossils found in the Tonian period indicate the presence of what creatures?
All the background I'm provided with is that "Trace fossils such as tracks and burrows found in the Tonian period indicate the presence of triploblastic worms, like metazoans, roughly as large (about 5 mm wide) and complex as earthworms.". Is that enough to answer the question?