Shark My Spirit Animal is a Grumpy Shark who Slaps Annoying People Shirt
Study the life cycle and fossilization of Carcharocles megalodon from the Miocene and Pliocene epochsStudy the life cycle and fossilization of Carcharocles megalodon from the Miocene and Pliocene epochsThe natural history of the megalodon (Carcharocles megalodon), a gigantic predatory shark that plied tropical and temperate seas during the Miocene and Pliocene epochs.The origin of sharks is obscure, but their geologic record goes back at least to the Devonian Period (419.2 million to 358.9 million years ago). Fossil sharklike fish appeared in the Middle Devonian Epoch and became the dominant vertebrates of the Carboniferous Period (358.9 million to 298.9 million years ago). Modern sharks appeared in the Early Jurassic Epoch (201.3 million to 174.1 million years ago) and by the Cretaceous Period (145 million to 66 million years ago) had expanded into the present-day families. Overall, evolution has modified shark morphology very little except to improve their feeding and swimming mechanisms. Shark teeth are highly diagnostic of species, both fossil and modern.
Shark My Spirit Animal is a Grumpy Shark who Slaps Annoying People Shirt
Sharks’ geographic ranges are not well known. Their extensive movements are related to reproductive or feeding activities or to seasonal environmental changes. Tagging returns from large sharks on the east coast of the United States indicate regular movements between New Jersey and Florida, and blue sharks have been recovered after crossing the southern Atlantic Ocean. A tagged spiny dogfish (Squalus acanthias) was recovered after traveling about 1,600 km (1,000 miles) in 129 days. Advances in tracking technologies include the use of satellite tags that continuously beam a signal to orbiting satellites whenever the shark surfaces and in that manner reveal north-south movements, transoceanic movements, and roaming and migratory patterns that are beginning to be understood for many species.Some members of the Carcharhinus genus—most notably the bull shark (C. leucas)—enter fresh waters. Riverine sharks are small to medium-sized and are exceptionally voracious and bold.
