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Spinosaurus is known to have eaten fish and small to medium terrestrial prey as well. [5] Evidence suggests that it was semiaquatic; how capable it was of swimming has been strongly contested. Spinosaurus's leg bones had osteosclerosis (high bone density), allowing for better buoyancy control.
Juvenile spinosaurid fossils are somewhat rare. However, an ungual phalanx measuring 21 mm (0.83 in) belonging to a very young Spinosaurus indicates that Spinosaurus, and probably by extent other spinosaurids, may have developed their semiaquatic adaptations at birth or at a very young age and maintained the adaptations throughout their lives ...
In the geologic record, the K–Pg event is marked by a thin layer of sediment called the K–Pg boundary or K–T boundary, which can be found throughout the world in marine and terrestrial rocks. The boundary clay shows unusually high levels of the metal iridium , [ 5 ] [ 6 ] [ 7 ] which is more common in asteroids than in the Earth's crust .
explain why particular groups of organisms died out and why others survived; provide mechanisms that are strong enough to cause a mass extinction but not a total extinction; be based on events or processes that can be shown to have happened, not just inferred from the extinction. It may be necessary to consider combinations of causes.
c. 106 Ma – Spinosaurus evolves. c. 100.5 Ma - Stegosaurs go extinct; c. 100 Ma – First bees. c. 94 Ma - First mosasaurs. [36] c. 93 Ma - Cenomanian-Turonian boundary event causes the extinction of ichthyosaurs and pliosaurs. [37] c. 90 Ma – the Indian subcontinent splits from Gondwana, becoming an island continent. Snakes and ticks evolve.
The Cambrian explosion (also known as Cambrian radiation [1] or Cambrian diversification) is an interval of time beginning approximately in the Cambrian period of the early Paleozoic, when a sudden radiation of complex life occurred and practically all major animal phyla started appearing in the fossil record.
The term 'heat dome' has gained prominence recently as climate change, El Niño and other variables have warmed global temperatures and shifted weather patterns. Heat wave or heat dome? Yes, there ...
Raymond B. Cowles proposed that the dinosaurs went extinct when Earth's climate became so hot and dry that it affected the ability of male dinosaurs to produce sperm cells. [23] 1946. Edwin Harris Colbert and others proposed that the dinosaurs went extinct when Earth's climate became too hot and dry to support them. [23] 1949