A variance in the rate, scale, and pattern, including trends and cycles.

The stability of a property, such as the speed of light.

The physical state in which forces and changes occur in opposite and off-setting directions.

Data and documentation that support inferences or conclusions.

A series of changes, some gradual and some sporadic, that accounts for the present form and function* of objects.

The skill of communication in which an interpretation of information is given and stated to others.

Complimentary aspects of objects, organisms, and systems in the natural world.

The quantification of changes in systems, including mathematics.

Tentative schemes or structures that correspond to real objects, events, or classes of events, and that have explanatory power.

The behavior of units of matter, objects, organisms, or events in the universe.