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What are the distinct characteristics of Cartilaginous fish?
Their skeletons are made of cartilage, they have jaws with sharp teeth and their bodies are covered with hard scales.
Their skeletons are made of bone, they have no mouths, and their bodies are covered with soft scales.
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Approximately how many species of fish have been discovered?
What are the three main groups of fish?
Jawless fish lack both scales and jaws and are the last survivors of the world's first what?
What two Jawless fish dating from over 5000 million years ago still exist today?
What group of fish developed 100 million years after jawless fish and are ancestors of todays sharks
What are the distinct characteristics of Cartilaginous fish?
What is the largest group of fish, with about 20,000 species?
What organ do some fish have which gives them buoyancy, the ability to float?
Why does the internal body temperature of fish changes as the surrounding temperature changes?
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