To use a dichotomous key, you start with question one, then you see which option applies to what you're looking for. Then you go to the question that that option leads you to until it stops at the answer. When I created my dichotomous key I started with the algae that had the least characteristics then went on so it narrowed down and made it easier to finish. Making the key was actually way easier than I thought it would be. I didn't really have any problems.
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