Biology, 29.09.2019 20:00 khalaflaf9381
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:
a.) a double dorsal fin, a small fin on the back near the tail, and barbs near the mouth.
b.) a single dorsal fin, no small fin on the back near the tail, and barbs near the mouth.
c.) a double dorsal fin, a small fin on the back near the tail, and no barbs near the mouth.
d.) a single dorsal fin, a small fin on the back near the tail, and barbs near the mouth.
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12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.
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Refer to this portion of a dichotomous key for fish identification to answer the question.
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