Groups of fossil plants and animals follow each other in a definite and determinable order, and any period of geologic time can be recognized by its respective fossils. this is a statement of the

your answer the principle of fossil succession.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a