This happens when two or more things influence or affect each other. This is a regular sequence which either exists in nature or is imposed through classification. Crystal structures can be identified by diffraction techniques because of the regular arrangement of their atoms. An organism is a living thing or something that was once alive. Fossils found in sedimentary rock provide evidence of organisms which became extinct a long time ago.
Perception is the interpretation of sensory input by the brain.
This is a repetition of a pattern within some larger structure. Numbers can be used to convey important information. Repetition of a procedure should produce the same results if all other conditions are identical. It is a necessary characteristic of scientific experiments. It is a relationship of events that substantiates the belief that natural phenomena do not occur randomly.