Biology, 24.08.2019 01:30 samarkanduzbek

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.

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According to this dichotomous key, any catfish must have a double dorsal fin, a small fin on the bac...