According to the geological record, during which time period did the lithospheric

Evolution refers to the change in the structure of an organism with the passage of million of years.

Explanation:

Evolution is the change in the structure of an organism with the passage of million of years. Evolution occurs due to two reasons, first from genetically while the other from adaptation to the environmental conditions. In genetically, the change in structure of animal comes from their parents whereas changes occurs due to adaptation of an organism in order to survive in the harsh climatic condition of the environment.