OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Correlation and CauseA cause-effect link is a stronger claim: the factor produces or contributes to the outcome. To support this claim, scientists look for a plausible mechanism—a credible process explaining how the factor could lead to the outcome. If no plausible mechanism can be identified, there are reasonable grounds for questioning the causal claim.