Which of the following best defines a scientific hypothesis?

A scientific hypothesis is best defined as a conjecture based on limited evidence. This means it is a proposed explanation or prediction that can be tested through experimentation and observation. It serves as a starting point for investigation, guiding scientists in their research and helping them formulate experiments to gather more data.

The nature of a hypothesis is inherently provisional; it is not a definitive or unchanging claim but rather a statement that can be supported or refuted based on experimental results. This flexibility allows scientists to refine their ideas and develop more accurate models of understanding as new evidence emerges.

The other definitions do not align with the essence of a hypothesis. An established scientific law refers to a statement that describes a consistent relationship observed in nature, and a theory is a comprehensive explanation supported by substantial evidence developed over time. Additionally, a proven fact implies absolute certainty, which is not a characteristic of hypotheses, as they must always remain open to investigation and revision based on new findings.