Do the living things on earth never change?

Viewed 58

On today’s earth, there are more than 1.5 million species of animals, more than 300,000 species of plants and more than 200,000 species of microorganisms. It can be said that from mountains to plains, from deserts to polar regions, from the air to the ocean, there are traces of life everywhere.

Today’s earth is a magnificent and colorful world of life. But more than 3 billion years ago, there were no flowers, trees, birds or beasts on the earth, and it was a dead and desolate place everywhere.

So where did life come from? About this question, some people in ancient China advocated that life was created by gods, some advocated that it was created by heaven, and more Westerners believed that life was created by God.

Whether it is "creationism", "heaven creationism" or "God creationism", they have one thing in common, that is, those created living things remain the same forever. Is this really the case?

Tadpoles turn into frogs, babies grow up, fruit trees blossom and bear fruit, these are all facts recognized by everyone; Africans, Asians, Europeans, although they belong to the same human race, but because of different regions, there are obvious differences. Different regions of the same kind of living things will also have different differences.

The remains, traces and relics of living things left behind in different geological ages are called fossils. Living things that existed in different geological ages and are still alive today are called living fossils. Because living fossils are a few living things that survived after a great disaster, they are also called relic living things. The closest geological age to today is also two or three million years.

Fossil records show that some living things that existed on the earth no longer exist today, and some living things that exist on the earth today have never appeared before. This shows that the types of living things change with time. In addition, the past and present of relic living things will also change in terms of morphology, size and so on. For example, the armadillos in South America are not what they used to be. They have obvious differences in length.

The comparison of living things of the same kind on islands and continents can also see the changes of living things. For example, there is a group of islands called Galapagos Islands 1000 kilometers west of the coast of South America. When the islands were first formed, there were neither animals nor plants.

Later, some living things from the South American continent migrated to the islands to live. Over time, some living things that reproduced on the islands were different from their counterparts on the mainland in terms of body shape and size. For example, the giant tortoises and finches on the islands were different from those on the mainland. The length of the neck and the shape of the shell of giant tortoises, and the size, habits and length and thickness of the beak of finches were different.

Conversely, if animals and plants never change, there would be no poultry, livestock and crops today. Because the latter are derived from wild species under human intervention.

Today’s chickens evolved from wild chickens. Today’s pigs evolved from wild boars. Today’s rice evolved from wild rice that looked like grass. Today’s corn’s ancestor was wild corn grass.

The history of the formation of poultry, livestock and crops is a history of human clever use of birds and beasts and wild plants. If animals and plants never change, humans would not be able to create poultry, livestock and crops no matter how smart they are.

Not only do populations of living things change, but individuals also change during their life cycle. Mammals live in their mothers’ bodies for a period of time before they are born. The embryos of mammals such as humans, rabbits, cows, pigs and other mammals all start from a cell called a fertilized egg. But in the process of development in the mother’s body, the embryos of mammals surprisingly all have similar features such as gill slits and tails.

This phenomenon shows that although different kinds of mammals have different appearances and sizes today, they were relatives in ancient times. If we continue to look back, we will find a common ancestor.

The fertilized egg of a mammal becomes a complete small animal. Although the change is very complex, the time it takes is not long. For example, humans and cows, after about 10 months, a fertilized egg that is hard to see with the naked eye becomes a small life with clear features. This shows that mammals change very quickly during this time in their mother’s body.

Many facts show that not only the same living thing changes, but also the types of living things on the earth change. So where did living things come from? There is no perfect answer to this question yet. But we are confident that as humans continue to explore scientifically, not only will the reasons for biological changes be revealed to the world, but even the mystery of where life came from will eventually be unveiled.

Dogs are also called domestic dogs. They are all domestic dogs, some are big and some are small. The small Chihuahua has a body length of only a dozen centimeters, while the Irish wolfhound has a body length of 1 meter. There are also breeds such as bulldogs, shar peis, pomeranians, poodles, etc., which are diverse and varied in shape.

There are so many breeds of dogs, which cannot be separated from artificial selection and breeding. There are still 35 kinds of ancestors of dogs with names. Some of them like to live alone like foxes, and some like to live in groups like jackals.

These diverse and varied dogs appear now because their wild ancestors have various changes. Humans select individuals with certain characteristics from wild dogs according to their own needs and preferences, and cultivate and breed them artificially. Over time, many different kinds of dogs appear in front of us.

0 Answers