"It is based entirely on observable, physical evidence from nature," he said.

However, there are two basic problems in interpreting the observable evidence available.

In the absence of observable, measurable evidence, the very question "What designed the designer?"

Cutans provide physical evidence, observable in the field, as to the degree and nature of pedogenesis.

Evolution, on the other hand, is based on solid, reproducible and observable evidence.

To be termed scientific, a claim must be based on observable, empirical, and measurable evidence, which is subject to systematic principles of reasoning.

"The observable evidence is that the contract has added liquidity to the market, thereby perhaps adding efficiency."

The claim would be that Jesus of Nazareth represented observable evidence of the divine nature.

All experimental, observable evidence, both in the lab and from astronomers, says that the speed of light does not change over time.

For example, the scientific method can verify that a statement is true based on the observable evidence that a thing exists.