sentence2_structure: The presence of an animal fossil in a rock<>gives<>evidence of the time period$$$the animal<>lived<>in
sentence1: One can actually go to the appropriate geological strata and find fossils of the animals that lived at that time period.
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