Short answers, pulled from the story.
The great white shark first unambiguously appears in the fossil record about 5.3 million years ago at the beginning of the Pliocene epoch. Paleontologists trace its ancestry to a large extinct species called Carcharodon hastalis which lived worldwide during the Early Miocene around 23 million years ago.
A 2024 study identified three distinct lineages within major ocean basins: Indo-Pacific, North Pacific, and North Atlantic. These groups showed little to no admixture suggesting they are allopatric and possibly reproductively isolated due to climate-driven oceanographic changes.
White sharks exhibit regional endothermy allowing activity in cool waters through a complex blood vessel system called rete mirabile. Warm blood generated from dark muscles is constantly supplied to other body parts via countercurrent exchange so heat remains within the body rather than exiting through gills.
Scientists propose sharks attack humans due to colorblindness inability seeing fine details determining whether silhouette above represents pinniped or swimming human. Other studies suggest exploratory biting testing environments routinely investigating novel objects potential prey by biting them frequently.
As of 2025 the International Union for Conservation of Nature classifies great white sharks vulnerable worldwide due to population declines ranging thirty percent to forty-nine percent over past 159 years. Estimated minimum five thousand eight hundred individuals likely twenty thousand total remain globally despite various threats including accidental catching fishing nets beach protection programs drum-lines and gillnets.