Old school Biologists (pre-DNA sequencing) would look at the physical characteristics of organisms and use that to determine how closely related they were. So we'll practice that as it's still a good rule of thumb when out in the field.
(Look!!! teeth, stripes, fast, tail, must be a TIGER!!! RUN!!!!)
We call these things DICHOTOMOUS KEYS, and you'll use one for sharks, and make your own for fish.
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