Why are organisms smaller today than they were in ancient times? What are the reasons for this?

Why are organisms smaller today than they were in ancient times? What are the reasons for this? I believe we all have a lot of questions about this issue, because we all know that in our real life, our research on science and human social problems is very in-depth.

Scientists in our country are concerned about the question of the origin of human beings, as well as the development of human society and the long-term economic development of human beings. In the process of continuous social and economic development in our country, there is a big difference between that time and the present compared with ancient times. Because, in ancient times, animals and many living things were very large, and that was because nature had just opened up.

So, compared to ancient times, why are the creatures in society so small in size today? In fact, the main reason is that it was in the pioneering stage of human society at that time, and animals such as dinosaurs that we are familiar with were very large, and the giraffes at that time, as well as some animals, and some fish creatures, were very large. However, with the development of social economy, the size of organisms in human society has become very small, so what is the reason?

Next, I will give you a detailed introduction.

I think the main reasons are as follows. Society is constantly evolving, and human society as well as living things in nature are evolving. Creatures such as dinosaurs, large fish, and orangutans, monkeys, and other creatures in ancient times were very large, and their size became very small due to changes in society, at least compared to that time.

Another reason is that living things are constantly evolving, and they are no longer adapting to the development and changes of society, let alone the development and changes of the natural world. Therefore, dinosaurs have not only disappeared, but human society has also changed, living things and some animals are constantly evolving, and people have become very small in order to adapt to the changes in society and the changes in the natural world.

Related to natural predators, society is constantly changing, the environment is constantly changing, and the temperature is also changing, because animals and humans are constantly evolving.

Because in the process of evolution, these animals have evolved to become smaller and smaller in order to ensure their own safety. It is related to environmental factors, to human factors, to development factors, to the world of animals, and to changes in the earth.

Because the current biological environment is very safe, there is no need to grow up, and growing up may make you die faster. Environmental reasons, food reasons, development reasons, natural enemy reasons, earth reasons.

Animals are relatively large, so the daily intake is very large, and the food resources are very abundant. In the course of the earth's billions of years of evolution, many large animals died out due to lack of food, such as the extinction of the dinosaurs, and a small number of moderately sized animals survived due to abundant food, resulting in today's situation.

After the age of the dinosaurs, living things became smaller and smaller? The 1 million-year-old extinct giant is proof of this.

Since the oxygen content of the earth at that time was several times that of today, the amount of oxygen absorbed by living organisms also increased. The most dangerous thing in the Carboniferous period was not reptiles, but giant insects, among which giant dragonflies were the size of eagles. Since they do not transport oxygen through blood, but through hollow ducts, the air enters directly throughout the body; In the Carboniferous period, there was a large number of dense and tall vegetation, and the oxygen content was dozens of times that of today, and the tubes of the insects became thicker and larger due to the increasing amount of oxygen they breathed.

Summary. Hello dear, the creatures that have become larger than their ancestors are: cats.

It is a popular animal, but in the past, their ancestors were much more different. Outwardly, their ancestor, the Fine-toothed Beast, is more like a modern mink, much smaller than a cat. They live mainly in trees, and may come to land when hunting.

They will feed on lizards and smaller mammals. In fact, the microdont is not only the ancestor of cats, but also mammals such as dogs, bears, and even seals. Hope it helps you <>

Do you have any other questions that I would like to answer for you, dear? <>

What are some of the creatures that have become larger than their ancestors?

In appearance, their ancestors are more like modern minks, much smaller than cats. They live mainly in trees, and may come to land when hunting. They will feed on lizards and smaller mammals.

In fact, the microdont is not only the ancestor of cats, but also mammals such as dogs, bears, and even seals. Hope you can help you <>

Do you have any other questions that I would like to answer for you, dear? <>

Is there anything else besides cats?

Malayan tapir oh dear.

And not much larger than modern creatures.

If you want to take dinosaurs as an example, the basis of the dinosaur's largeness is its unique air osteogenesis and air sac dual respiratory system of this large species, which is large but lightweight, and you can use your hand to slip the rooster of the same physique of the raptorsauridae and the carnivorous dog of the Zygotosaurus family, with a weight difference of at least four times. In fact, the mastodon, the largest mammal, weighed the same as the largest titanosaur in the dinosaurs, reaching the limit weight of a terrestrial animal.

Another restriction on the physique of large animals is the level of nutrition, giant physique means massive food consumption and lower adaptability to environmental changes, in the middle of the evolution of each dominant species, due to the relaxed environment, abundant food, rich diversity, each era has a tendency to large-scale, after a period of competitive elimination, large-scale species will inevitably disappear in the increasingly harsh trophic level differentiation, even at the beginning of the late age of the dinosaurs that were forcibly pinched by asteroids, There are no more large sauropod dinosaurs, and there are only five or six species of giant carnivorous dinosaurs left.

This is especially true in today's world, since 4 million years ago, human beings stood on the earth, this species that knows how to store food and cut grass and eradicate roots consumes much more nutrients from the environment than it needs in its natural state.

The body type of an organism is mainly controlled by genes and dietary habits, and genes are the most important part, but eating habits and what you eat will also determine the body size of an organism.

They will be controlled by the environment, because the environment at that time is relatively good, so that they can live a carefree life, and their body size is relatively large.

Controlled by the environment, diet, because the current social environment is different from the previous environment, and the food is not the same.

Affected by social factors, it was because the animals at that time were relatively large and had almost no natural enemies, so there was a situation of wanton growth, and the air oxygen concentration at that time was relatively high, so it provided very favorable conditions for the growth and reproduction of these animals.

In ancient times, food was abundant, and creatures were only strong and weak according to their size, so they all evolved to be larger.

At that time, the oxygen concentration was relatively high, which must have something to do with this climate.

The breath contains a lot of oxygen, so it's big.

Genetic mutations of biochemical radiation.