IB skill practice

Evaluate biological investigation validity and uncertainty

Syllabus-aligned Biology HL systems, ecology, and investigation skill with approved production seeds.

Paper 1, Paper 2 5 marks Difficulty 5

Evaluate correlation and causation

A field dataset in a plant systems lab shows higher nitrate levels where algae cover is higher. Explain why this alone does not prove nitrate caused the algae increase. Enter the answer and choose the interpretation that best matches the HL Biology evidence.

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