What animal first appeared on land? Detailed answer

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What animal first appeared on land? Detailed answer

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What animal first appeared on land?

Not everyone agrees with the theory of evolution, but according to its proponents, animal life (including fish, birds, and insects) appeared on Earth more than 500 million years ago, after the earth's surface cooled and the oceans formed. Most scientists believe that life originated in the ocean. And only 160 million years after that, it arose on land. Then strange, fish-like creatures began to crawl out onto the land. At first their movements were very clumsy because they had no legs. Instead of legs, they were forced to use their fins for a long time. And only many generations later, their fins turned into legs.

While these changes were happening to them, they still laid eggs in the water, from which the young generation hatched. These creatures, whose ancestors looked like fish, gradually learned to walk and turned into amphibians (cold-blooded animals that spend part of their lives on land, born from eggs laid in the water).

After some time, some of the amphibians stopped laying eggs in the water. When this happened, amphibians turned into reptiles (cold-blooded animals that reproduce by laying eggs on land). Reptiles inhabited the earth for more than 100 million years before some of them developed feathers on their bodies and their forelimbs turned into wings. After some time, they learned to fly, and thus birds appeared.

Other types of reptiles stopped laying eggs and turned into animals resembling mammals that give birth to their young. In addition, they became warm-blooded and then evolved to the level of true mammals.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Where did the transition to the metric system almost lead to a plane crash?

In 1983, Canada was moving to the metric system, and Air Canada ordered new Boeing 767s that were set to liters and kilograms instead of gallons and pounds. Incorrect use of new units of measurement by the crew of one of the aircraft led to the fact that the amount of refueled fuel turned out to be much less than required for the flight. As a result of this error, as well as errors onboard equipment, mid-flight at an altitude of 12 meters, the fuel ran out and the engines stopped. To the credit of the crew, the pilots managed to glide onto the runway of the former military base, and the passengers escaped with only minor injuries.

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