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

according to this dichotomous key, any catfish must have

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.