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Materials on Earth cycle between living organisms and the environment. Microorganisms are vital for these cycles. They break down dead matter and release the materials back to the environment.

Organisms interact with and rely on one another to survive. They also rely on a stable environment. Changes to organism numbers and the environment can determine whether an organism will live or die.

Understanding how to approach exam questions helps to boost exam performance. Question types will include multiple choice, structured, mathematical and practical questions.