A biologist is using a dichotomous key to identify fish.1. (a) Has a single dorsal fin ® 5 (b) Has a double dorsal fin ® 22. (a) One fin is spiny, the other is smooth ® 3 (b) One fin is not spiny or smooth ® 45. (a) Has small fin on back near tail ® 6 (b) Has no fin on back near tail ® 76. (a) Has barbs near the mouth ® Catfish (b) Does not have barbs near the mouth ® 107. (a) Tail is asymmetrical ® 8 (b) Tail is symmetrical ® 910. (a) Scales are small ® Trout (b) Scales are large ® WhitefishWhat is the next step to take to identify a fish that has a single dorsal fin and no fin on the back near the tail?
A fish with a single dorsal fin follows step 1(a) to step 5. At step 5, having no fin on the back near the tail matches choice (b), which directs you to step 7. Therefore, the next step is step 7.
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