sentence2_structure: The presence of an animal fossil in a rock<>gives<>evidence of the time period$$$the animal<>lived<>in
sentence1: Several pieces of evidence are needed to show that a rock was used by a fossil animal to aid its digestion.
sentence2: The presence of an animal fossil in a rock gives evidence of the time period the animal lived in.
question: The presence of an animal fossil in a rock gives evidence of