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  • The Secret World of Sharks and Rays | Sharks Great and . . . - PBS
    Researchers do know that sharks and rays are some of Earth’s oldest fish Once, more than 400 million years ago, the two groups shared a common ancestor that swam through the planet’s oceans
  • Things in the universe younger than sharks, has this been . . .
    If you guys don't mind a random post- I have realized that when in doubt the best unit of time to describe how old things are in context is whether the thing is older or younger than sharks You see, the first sharks appear to have evolved ~450 million years ago, which is frankly a pretty decent chunk of astronomical time, (or, in other words
  • 13 Awesome Freshwater Aquarium Sharks to Enhance Your . . .
    While you can temporarily raise juveniles in smaller set-ups, there aren’t any varieties of sharks small enough for 10-gallon tanks as adults A few types of freshwater sharks are more suited to pond life than an aquarium at maturity, unless you have a tank that’s 300 to 500 gallons Filtration and Water Requirements
  • Shark-Infested Waters: 7 Shark Species Found in the Indian . . .
    The Indian Ocean spans the globe from Asia in the east to Southern Africa, covering 21 million square miles Within these warmer waters swim 19 species of sharks, some more dangerous than others So, are there sharks in the Indian Ocean? In short – yes Sharks prey on other marine life such as eels, rays,
  • Your Biggest Questions About Sharks, Answered
    Counting SCUBA diving for fun, research expeditions and trips to aquariums, I’ve seen 53 species of sharks This is a little less than 10% of all the shark species that exist, according to the upcoming edition of the “Sharks of the World” reference guide, so I’ve certainly got a lot more work to do! What’s your favorite species of shark?
  • Megalodon - Wikipedia
    In this model, the great white shark is more closely related to the extinct broad-toothed mako (Cosmopolitodus hastalis) than to megalodon, as evidenced by more similar dentition in those two sharks; megalodon teeth have much finer serrations than great white shark teeth The great white shark is more closely related to the mako sharks (Isurus





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