Why did the megalodon go extinct in prehistoric times without natural predators?

I've also seen this movie, about whether megalodons are really extinct? There is a theory that because the megalodon feeds on cetaceans, the cold waters at the poles are not suitable for the megalodon to survive, so the cetaceans can escape the hunt of the megalodon, leading to the extinction of the megalodon due to lack of food. There is another scientific theory and theory that the megalodon is extinct

Any impact on the food chain (about 1.5 million years ago, the Earth's water cycle changed, upwelling decreased, a large number of cetaceans died due to food scarcity, and a variety of cetacean species became less diverse) would be eliminated by predators with huge metabolic demands.

Does the absence of natural predators mean that there will be no extinction? This logic is wrong, the absence of natural enemies can only indicate that this creature is relatively strong or special, but the extinction of the species is not directly related to the existence of natural enemies. Let's take an inappropriate example, human beings are the most powerful species on the planet, at the top of the food chain, they eat whoever they want, the premise is only to consider whether they can eat or not, we can think that human beings have no natural enemies, but if one day the food is gone, then will the human race perish?

The answer is obvious, it won't take a few days to die. Looking at the megalodon, it was indeed a prehistoric creature, living between 15 million and 2.6 million years ago, and some scholars even believe that it was the most powerful creature on the planet at that time. But if one day, the environment of the ocean changes, causing its prey to become extinct, or if there is a way to defend itself, is it the megalodon "bad luck"?

Indeed, many theories suggest that it is a change in the food chain that affects these apex predators.

Megalodon is an ancient creature, and the ancient environment is relative to the present, the biggest difference is the difference in oxygen content, because of the abundance of oxygen in ancient times, the size of the creature is significantly larger than the body size of the current organism, and the nutrients needed to maintain the survival of the creature will also be very large, which leads to the violent turbulence of the earth's environment, the reduction of oxygen content, the collapse of the food chain, will make the predators at the top of the food chain either extinct. The food of the megalodon **, considering its huge size, it is estimated that the general small fish and shrimp he can not look down on, can only focus on the whale level of large creatures, once the whale because of environmental changes, run to the sea area that is more difficult to catch, such as near Antarctica or near the Arctic Ocean, the cold-blooded megalodon is difficult to set foot in, so far, either change the diet, or change yourself. Then there are no megalodons, but other sharks.

Prehistoric creatures do have a relatively small number of natural enemies, such as dinosaurs, the overlords of the earth, they can rule the earth for millions of years, and there are no natural enemies, and the megalodon is the same, with such a huge size in the water and strong attack power, there are indeed no natural enemies. But why is it extinct, dinosaurs are the same, so is the megalodon, everyone is also talking about the extinction of the dinosaurs, and the megalodon should be the same, in fact, it is not so much a natural predator, but the environment. The earth's environment may be the biggest threat to a race, for example, no matter how large the dinosaurs are and how strong their attack power is, but if they are affected by natural disasters, volcanic eruptions, lava flows, no grass, no food, no living space, they will definitely starve to death.

Similarly, the living environment of the megalodon is the same, the temperature of the sea water rises, the submarine volcano erupts, the marine life is gone, the megalodon has no food**, the food chain is broken, and it is naturally extinct.

The main cause of the extinction of the megalodon is environmental change, in fact, since the Miocene, the earth has continued to cool. As the climate cools, a large amount of sea water freezes into polar glaciers, causing sea levels to drop, and the shallow waters that used to hunt for juvenile megalodons disappear, leaving megalodons without a breeding base for juveniles. During this period, the megalodon's main food, small baleen cetaceans, began to grow in size to keep warm, and began to feed in the cold polar waters.

Unable to live in the cold seas, the Megalodon could only watch its food leave, and the reduction in food was a major blow to the Megalodon.

Because there are killer whales, in terms of IQ, on selling cuteness, on being tall, that is, eating more, how can there be so much food for you to eat, so the killer whale successfully killed it.

Mainly due to starvation due to lack of food, plus more powerful predators, such as dunkle's fish, and climatic reasons.

There is no extinction, just evolution.

Climate change will lead to extinction, which species have you ever seen extinct by predators...

Documentary: Prehistoric giants. It depicts the dragon being preyed on by a megalodon at first (about the same size). Then, after a long evolution, the struggle to swallow the megalodon alive was a long history. It was this evolution that caused the megalodon to be almost completely preded by the dragons