Refer 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

What do the numbers after the arrows represent?
the number of the question that should be considered next
the number of points that should be added to the organism’s identity total
the probability that the organism has the described characteristic
the number of species that have the described characteristic