How to become a turtle? The process by which a turtle becomes a fossil

Turtle fossils are rocks from the remains of turtles that lived in the distant past.

1. In the long geological time, there were countless creatures living on the earth, and many of the remains of these turtle creatures after their death were buried by the sediment at that time.

2. In the years that followed, the organic matter in the remains of these turtle creatures was decomposed, and the hard parts such as the shell, bones, branches and leaves, together with the surrounding sediment, were transformed into stone by stone imitation land, but the original shape and structure of the turtle (and even some subtle internal structures) were still retained.

3. Therefore, we refer to these petrified turtle biological remains as turtle fossils.

Definition of fossils:

Fossils are the remains or ruins of creatures that lived in the distant past. Many were buried by the sediment of the time. In the years that followed, the organic matter in the remains of these creatures was depleted and dissolved; In the same way, the traces left by those creatures when they lived can be preserved in this way.

We call these petrified biological remains and relics fossils.

From the fossils, you can see the appearance of ancient animals and plants, so that you can infer the living conditions and living environment of ancient animals and plants, you can infer the age of the formation of the strata where the fossils are buried and the changes they have undergone, and you can see the changes of organisms from ancient times to the present, and so on. <>

Why did the turtle, which has been raising a good loss for several years, suddenly "mutate"?

The mutation of the turtle is formed by the mutation of the genes in the body, and each mutation of the turtle is formed by different markings. For example, it takes several generations for an albino turtle to have good genetic stability.

The semi-carapaceed tooth turtle appeared in Qiannan Buyi and Miao Autonomous Prefecture of Guizhou Province, China, about 2 200 million years ago during the early Triassic of the Mesozoic Era.

The semi-carapace-toothed turtle is not only the oldest known tortoise, but also the most primitive known tortoise, and they may be a transitional species. The tortoise shell is only half formed: the dorsal and ventral tortoise shells of modern turtles form a complete tortoise shell, while the semi-carapace turtle only has a complete ventral surface of the tortoiseshell, and only the nerve plate on the back does not form a complete dorsal carapace.

The ventral carapace of the turtle is evolved from the ventral ribs; The specialized spine and the widened ribs are gradually joined together to form the dorsal carapace. In addition to the teeth in the mouth and the lack of dorsal armor, the turtle has many primitive features. The interface between their spine and ribs is different from that of later tortoises.

At the same time, the proportions of the skull of the semi-carapace-toothed turtle are also different from those of later turtles, with a longer part in front of the eyes. The transverse process of the caudal vertebra did not heal.

He was a reptile, the first animal to climb onto land, and then evolved into a hard shell, which slowly evolved ...

The ribs slowly widen and gradually grow together **disappear and slowly grow into what they are now.