Why can t animals grow as big as dinosaurs anymore?

The blue whale is the largest and most important animal in the world, reaching up to 33 meters and weighing more than 181 tons! One of its mouths will be 2 tons, its skull will be more than 3 tons, its cardiovascular system will be more than 500kg, and the total output of blood in the whole body will reach 8 tons! But don't look at the huge size of the blue whale, but it feeds on krill and small fish, and sometimes large squid!

Another reason for nature is that the food is very abundant, dense forests, thousands of animals walk through it, there is no need to worry about the highest test of survival - food, so the world of dinosaurs is a period of size advantages, higher size means that it has more network resources, whether it is herbivorous or carnivore! Under the natural law of survival of the fittest and the strong of the jungle, the expansion of microorganisms has become an inevitable trend! In fact, people can't do this, there is no doubt that there were not such large animals after the Cretaceous, but compared to the fragile double-chambered dragon, the animals after the Cretaceous were relatively small!

For example, the titan python from 6000 million years ago to 58 million years ago has an average length of more than 12 meters and weighs more than 1 ton! The larger Amazon Python is only a fraction of it! The tallest animal ever lived, the blue whale, is still inhabited on Earth, and so many dinosaur fossils have been excavated today, but there is no direct evidence that any Tyrannosaurus rex was larger than a blue whale.

Although there are a few ichthyosaur fossils suggesting that there was a very possibility that there was an oversized ichthyosaur that was likely to exceed the size of a blue whale, but it is very likely, but the ichthyosaur was not a Tyrannosaurus rex. Ichthyosaurs are a little closer to the big crocodile. ）

It's not that the animals on the earth grow slowly, it's that these large and medium-sized animals that could have lived to the bottom have been extinct by humans. For example, mammoths, elephants, and mastodons are also divided into many different types, large and medium-sized and miniature, so many animals are larger than many Tyrannosaurus rex. Due to the changes in weather and environmental pollution of conditions, and the era of astral collisions have killed the first large animals.

The rest are the seeds of the genes of small start-ups; It has always grown slowly and passed with it.

It may be because animal life is more advantageous nowadays; It may be that the natural environment is getting worse and worse, it may be that there are fewer and fewer natural enemies, so they do not exercise regularly, and their physical fitness and function are slowly declining, all of which may limit their growth.

Mainly because there are more and more originals on the earth now, and the environment and natural predators will also affect the growth of animals, and it is difficult to find food in some remote areas.

I think it may be caused by the development of the current environment and their survival characteristics, after all, the current society requires the survival of the fittest; It may be that their digestive system is limited, and the current animals have a reduced digestive function compared to before, and the oxygen content is not very high.

The reason why dinosaurs were able to grow so big was mainly due to the following reasons:

1.Diet: Dinosaurs were herbivorous or carnivorous animals whose main diet was plants or other animals. Large dinosaurs need to consume enough food to meet their energy needs, so they need large-caliber mouths, as well as strong necks and limbs.

2.Huge body size and bone structure: Large dinosaurs needed strong bones and ligaments to support their body weight. They also require stout legs and feet to support and move the body.

3.Circulatory system: Dinosaurs needed a strong cardiovascular system and the ability to take in high oxygen when fighting predators.

4.Predator Match: Dinosaurs lived in an environment full of powerful predators, and the size and strength of large dinosaurs could help them gain an edge over the competition and thus survive.

In conclusion, dinosaurs were able to grow so big because their ecological environment and evolutionary history shaped the physical characteristics and physiology of this species, so that it adapted to the environment and survival needs of the time.

There are several reasons why dinosaurs can grow so big:

1.Well-developed muscular system: Dinosaurs had well-developed muscular and skeletal systems, which were able to withstand huge heavy skin loads and exercise loads.

3.Abundant food: In ancient times, the earth was rich in food resources, and dinosaurs were able to obtain enough nutrients to support their growth.

4.Breeding strategy: Dinosaur populations are huge, they are able to reproduce quickly, and they are able to grow quickly at the beginning of their growth, which also promotes the rapid growth of the entire population.

To sum up, the fact that dinosaurs could grow so big was the result of a series of evolutionary strategies to adapt to the environment.

The reason why dinosaurs can grow huge is that the concentration of oxygen and carbon oxides in the earth's air at that time was higher than now, and the higher the concentration, the larger the size of the organism, and at the same time, the earth's gravity at that time was smaller than now, the burden of weight was smaller, the animals and plants were abundant, and the food was sufficient, so the dinosaurs could be very huge. Dinosaurs, refers to the recent common ancestor of Triceratops, modern birds, and Diplodocus and all their descendants. To facilitate research, dinosaurs can be divided into avian and non-avian dinosaurs.

Among them, non-avian dinosaurs lived only in the Mesozoic era (Triassic, Jurassic and Cretaceous) and were all extinct 65 million years ago. <

The reason why dinosaurs can grow huge is that the concentration of oxygen and carbon oxides in the earth's air at that time was higher than now, and the higher the concentration, the larger the size of the organism, and at the same time, the earth's gravity at that time was smaller than now, the burden of weight was smaller, the animals and plants were abundant, and the food was sufficient, so the dinosaurs could be very huge. Dinosaurs, refers to the recent common ancestor of Triceratops, modern birds, and Diplodocus and all their descendants. To facilitate research, dinosaurs can be divided into avian and non-avian dinosaurs.

Among them, non-avian dinosaurs lived only in the Mesozoic era (Triassic, Jurassic and Cretaceous) and were all extinct 65 million years ago.