Final answer:
Fossils found in rock strata can tell us about the diversity of organisms and how they have changed over time, but they cannot provide the exact age of each individual fossil.
Step-by-step explanation:
Fossils found in rock strata provide valuable information about the history of life on Earth. They can tell us about the diversity of organisms at a certain location or during a certain time period, as well as how a type of organism has changed over time. However, one thing that we cannot learn from fossils is the exact age of each individual fossil.