[Today's Lisa Zate Topic] Until the birth of humans 4
4. After the birth of animal and plant cells
The conditions for landing on life were met early on. The magma that blows up from the center of the earth 2.5 billion years ago, and the ozone layer that covers the earth, stopped the heat coming from the sun on the surface of the earth, but cut off the ultraviolet rays and X-rays that destroy genes before reaching the earth.
Organisms that became multicellular organisms more than a billion years ago bloom at once in the Cambrian period. It has grown into a series of creatures today and has grown in size. From among them, life will land one after another.
① Insects feed on each other
(2) Plant roots grow under the surface of the water and gradually grow tall, and when the water's edge is filled with plants, a new event occurs.
With the advent of gymnosperms, the ground turned green as I saw it. And it was covered with lava and changed the earth. The lava-bearing plants released organic acids from their roots and melted the lava. Furthermore, microorganisms such as bacteria gather in search of the organic acid. It decomposed dead plants and turned rocky ground into soil. Fifty million years later (Devonian), 300 million years ago, four-legged creatures were born from fish, and various creatures were born.
Born 240 million years ago in Thrinaxodon. The insects acquired feathers and flew around in the sky. The birth of cockroach ancestors was also around this time. Plants have noticed the movement of this insect and created a way to grow through insects. The birth of a flower. Around that time, the first mammal, Crusafontia, was born, and the physical condition was 20 to 30 CM.
However, he still lived quietly on the ground. That's because there were dinosaurs. He played a leading role on the planet for a long period of 160 million years. (Rio Alibaba Saurus, Thecodontosaurus, etc.).
In the Jurassic period, dinosaurs become bigger and bigger and head for the golden age. (Stegosaurus, Diplodocus, etc.) and overwhelmed other animals. Birds were born around this time.
Cretaceous; As the continents split and the environment changed, the types of dinosaurs increased accordingly. (Tyrannosaurus, Ankylosaurus, Edmontonia, the strongest Triceratops, etc.)
At the end of the Jurassic, after a giant herbivorous dinosaur disappeared from North America, a dramatic alternation of generations took place among the plants. Flowering plants have begun to proliferate. At the same time, the earth became hot and dry, making it difficult for plants to live in. And although the range of conifers continued to be limited, the flowers grew with the insects. The dinosaurs ate up the plants from one end, but the flowers have grown since then. In this way, the flowers turned into colorful stars.
65 million years ago, dinosaurs disappeared from Earth. The exact reason is still unknown. It is said that the dinosaurs could not respond and became extinct, probably due to some major changes and changes in the temperature of the earth.
The era of long, long dinosaurs suddenly ended.
Continue to " 5. Birth of Humans " next time
Basic story from myashdom.org
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