Rory is trying to identify a trerefer to this portion of a dichotomous key for fish identification to answer the question.
1. (a) has a single dorsal fin → 5 (b) has a double dorsal fin → 2
5. (a) has small fin on back near tail → 6 (b) has no fin on back near tail → 7
6. (a) has barbs near the mouth → catfish (b) does not have barbs near the mouth → 10
according to this dichotomous key, any catfish must have a double dorsal fin, a small fin on the back near the tail, and barbs near the mouth. a single dorsal fin, no small fin on the back near the tail, and barbs near the mouth. a double dorsal fin, a small fin on the back near the tail, and no barbs near the mouth. a single dorsal fin, a small fin on the back near the tail, and barbs near the mouth.e from one of its leaves. a question on the dichotomous key that he is using asks whether the leaf has 3-5 lobes or more than 5 lobes. rory cannot tell whether the leaf in his hand has 5 or 6 lobes. what should rory do to continue identifying the tree?

a) Look at other leaves from the same tree, and count how many lobes they have.
b) Skip this question, since one question does not make a difference.
c) Start over from the beginning of the dichotomous key.
d) Find a different dichotomous key to use that does not ask this question.