According to the principle of faunal succession, what must be true of the fossils on a layer below​

Explanation:

Absolute dating is required to determine the relative age of animals based on their fossils. Specific groups of organisms have followed one another in a definite sequence through the Earth's history.

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false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation: