The following outline is provided as an overview of and topical guide to sharks: Sharks (division Selachii) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 440 million years ago, before the time of the dinosaurs.
The following outline is provided as an overview of and topical guide to sharks: Sharks (division Selachii) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 440 million years ago, before the time of the dinosaurs.
Source: Wikipedia "Outline of sharks" · CC BY-SA 4.0
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