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

a- what do the numbers after the arrows represent?
b- the number of the question that should be considered next
c- the number of points that should be added to the organism’s identity total
d- the probability that the organism has the described characteristice- the number of species that have the described characteristic