Trace fossils can be defined as the ones that provide geological records of the behavior and activities of past life.
- These are also known as Ichnofossils.
- Trace fossils include borings, track and trails, burrowings, and coprolites and gastrolithes.
- Among the given examples, the evidence of past life is provided by the burrows of animals.
Hence, among the given examples, trace evidence is an animal burrow. Therefore, the correct answer is option a.
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