A testable guess about why or how something happens (e.g., “The sky is blue because of scattered sunlight”).
- A hypothesis is an educated guess or proposed explanation for a phenomenon, based on prior knowledge and observations.
- It must be testable and falsifiable.
- Example: “Plants grow faster in red light than in blue light” is a hypothesis because it can be tested through experiments.
- Key Point: A hypothesis is the starting point of scientific investigation.