5 Questions
Which of the following is NOT included in the definition of a fish?
Sharks
What percentage of living fish species are ray-finned fish?
95%
During which period did the first fish with jaws appear?
Silurian period
What allowed the soft-bodied chordates to be more agile than their invertebrate counterparts?
Notochords
What did many fish of the Paleozoic era develop as protection against predators?
External armor
Test your knowledge about fish and their classification with this quiz. Learn about different types of fish, their characteristics, and their evolutionary history.
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