What's symbiosis?
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interaction between two different organisms living in close physical association, typically to the advantage of both.

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Symbiosis is the interaction between two different organisms living in close physical association. ... They may share habitats or lifestyles or interact in a specific way to benefit from the presence of another organism. We often refer to animals living in tandem as 'associates.

Explanation:

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what are the choices?

cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.