How and why are dichotomous keys are used

A dichotomous key is a type of single-access key that gives only two choices at one time, These keys are commonly used in biology in order to identify an unknown animal or plant.

Dichotomous keys are very useful because they allow non-expert users to identify organisms by directing them to look at the known, important organisms.

Explanation:

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.