What evidence is there that the megaladon shark extinct?

Fossil record: The fossil record of megalodon is extensive, with teeth and vertebrae found in marine sediments worldwide, providing evidence of the species' former existence. However, the youngest known megalodon fossils date to around 2.6 million years ago, indicating their extinction occurred during the late Pliocene or early Pleistocene epochs.

Lack of modern sightings: Despite being one of the largest and most formidable marine creatures to ever exist, there have been no credible modern sightings of megalodons. This suggests that the species did indeed become extinct, as its size and abundance would likely make it difficult to miss in the modern ocean.

Paleoceanographic changes: The transition from the Pliocene to the Pleistocene epochs was marked by significant environmental changes, including cooling global temperatures, sea level fluctuations, and changes in ocean circulation. These changes might have affected the availability of food sources or their habitats, ultimately leading to the extinction of megalodons.

Competition from other predators: Megalodons were apex predators, but they likely faced competition from other marine predators, such as the great white shark (Carcharodon carcharias) and the now-extinct Livyatan melvillei, a giant sperm whale. Competition for resources and habitat could have contributed to the decline of megalodon populations.