Chapter 4: The oxygen content of the ocean rises and animals

　　 The scorching sun of the sixth day passed and the night of the seventh day came, and the chrysanthemum still lives in peace in the ocean.
　　It eliminated 99% of the species, successfully survived the second biological extinction, and dominated the entire ocean, becoming the perfect species to survive completely under the harsh environment of 5,000 years of alternating sun and moon.
　　At the same time, with its mass reproduction, the photosynthesis of aquatic plants has increased dramatically, the oxygen content in seawater has been greatly increased, and oxygen is suitable for the birth of marine animals.
　　 Soon, some invertebrates began to appear in the ocean, a group of black beetles, similar in shape to the ancient species, the horseshoe crab.
　　 At this point, marine animals have entered the historical stage of the evolution era. After the Guangwu Period, the plants completely survived steadily, and the creatures in the sand table also ushered in a big explosion and species diversity.
　　 "Animals, finally appeared, I have waited for you for a long time, and waited for two species extinctions."
　　 The moment he saw the animal appeared, Xu Zhi showed a gratifying smile. After a long day and night, his tired body finally couldn't carry it, and went back directly to the room and lay down and fell asleep.
　　 He woke up and was the eighth day of the evolution of the spore sandbox.
　　 "Ah, wash your face, brush your teeth."
　　 Xu Zhi got up from the bed and his stomach was really hungry.
　　 is terminally ill, and no longer takes care of his body. He is just looking for death. He went out of the compound and rode a bicycle, facing the bright sunshine, on a country road, on both sides of the neat farmland. The air was fresh and natural.
　　 He ran out to the county and got a breakfast before returning. When he returned to the orchard yard, it was already more than nine in the morning.
　　 He continued to look at the sand table.
　　 After a night, more than forty square meters, a miniature ocean comparable to the size of a swimming pool, has changed dramatically. The ocean is full of vitality, and marine animals have been everywhere.
As an ancestor of plants, chrysanthemum has evolved various strange-shaped marine plants, and even some marine plants, can no longer see the shape of their ancestors.
　　 as a plant overlord, the entire marine plant is its descendant.
　　 And for those marine animals, the overlord takes arthropods as the apex of the food chain, and they have a strong shell. They are the strongest armor and do not have any natural enemies.
　　 Among them, the strongest one is an insect similar to the ancient trilobite, which dominates the ocean.
　　 They are the first creatures that have evolved their eyes. They have a visual system and a solid shell. Any animals and plants are their prey!
　　 "This evolved the equipment beyond the age-the eyes..." Xu Zhi came back after a breakfast and saw that some creatures had evolved his eyes, and was a little shocked.
　　Biology basically has eyes, which is modern common sense.
But in the Cambrian, marine outbreak species, everyone is blind, all creatures have no eyes, swimming blindly in the sea, evolved such powerful equipment as the eyes, beating a group of blind people, it’s not too easy to board instantly At the top of the food chain, go to the peak of life.
　　 Species with eyes are invincible in the food chain, and they began to multiply in large numbers. They quickly eliminated those species that could not evolve with eyes. The entire ocean soon began to enter the era of "eyes" for all people.
　　But these eras of invertebrates with eyes did not prosper for a long time. It was another 5,000-year sun-moon alternation. On the ninth day, another ancient overlord, vertebrates appeared.
　　 Xu Zhi clearly saw that it was a black fish in the sea!
　　 If it is said that most invertebrates of this era, a layer of exoskeleton armor wraps the meat and has a very strong defense, then the vertebrate is soft meat that wraps the bones.
　　 They seem stupid, go the opposite way, put their weakest meat on the outside, and put the hardest bones inside, they can own the vertebrae, and the biological structure of the internal skeleton can be extremely dexterous.
"You come out of flesh outfit, full body armor, slow speed, but others are smartly equipped, without defense, but have a backbone, you can't run away from others, you can't eat." Xu Zhi sat in a chair beside the ocean, cutting apples, watching This scene, suddenly laughed, I feel very interesting, but it is a very reasonable evolution.
　　 The two sides are still in a state of close competition.
　　 On the tenth day, the balance was broken.
　　 A red spine fish has evolved its lower jaw teeth and became the world's first jawed fish.
　　 It spreads the backbone of the flesh and blood, the spine, to the head. The bone at the top of the spine is placed in the throat, forming hard teeth that can easily crush the armor of those animals.
　　 Animals, the second horrible cross-century equipment-teeth, also appeared!
　　In an instant, the strongest weapon in the era of teeth, following the eyes, changed the entire marine ecosystem.
　　 Those ancestors of trilobites, shrimps, and crabs in armor were preyed, and their invincible shell defenses were broken, exposing the tender meat inside, and the carapace was no longer invincible.
　　 On the tenth day, belong to the era of vertebrate dominance... Completely coming!
　　 This fish has a mouth and flicks its tail by swimming in the spine. It has been regarded as a real fish.
　　It is not only the ancestor of fish, but the ancestor of all vertebrates, but also the ancestor of man.
　　 Even today, hundreds of millions of years later, lions, tigers, humans, elephants, whales, sharks, and any powerful creature standing on the top of the food chain are no exceptions. They are vertebrates.
　　 And this fish swims leisurely in the sea, and I don't know how brilliant he has laid for the brilliant civilization era in the future!
"It has already begun to have animals and chose to leave his mother to conceive the origin of life-the ocean." Xu Zhi saw this and found that there were already marine animals, and he began to dissatisfy the highly competitive ocean and evolved into amphibians. Living on the barren coast.
　　The marine plants in the sea began to climb to the shore and became terrestrial plants. The barren and yellow land was full of greenery.
　　However, due to Xu paper's genetic limitations, the direction of their evolution is the shape of an ant, and even the largest plant is the size of a finger.
　　 After all, huge is not powerful.
　　The mother nest of the previous generation also explained before dying, UU reading www.uukanshu. Some small mysterious bodies of com can also possess the energy of throwing up hands to destroy the world. Concentration is the essence, and the compression of the quality of life of the body shape will cause qualitative changes.
　　 These tiny super-paleozoic species have extraordinary potential!
　　Xu Zhi saw this, and recorded the next page of the Guangwu Period with Qingxiu's handwriting. This evolutionary era, he named it the Neogene:
"The Cenozoic era, the era ushered in a new life, all kinds of animals broke out, the first batch of marine animals appeared, the species was flourishing, the males were striking, the invertebrates relied on the carapace, and dominated the waters for a while, becoming the era overlord, but it has never been hegemonic, The vertebrate was born and defeated with dexterity. The vertebrate became the overlord of the Neogene and will rule a long and vast era!"
　　 Xu paper finished everything and silently closed the book.
　　 He also turned his head and left this highly competitive sandbox.
　　 "It's really fast, I'm going to have a breakfast kung fu, spores, will soon go out of the ocean, and evolved terrestrial species..."
　　 The spore cells of the insect nest, even if it was only given to such a small place to multiply, also realized the diversity of species and formed a preliminary ecological circle.
　　 Xu Zhi suddenly raised his eyebrows, "However, to evolve intelligent creatures, I don't know how many long epochs are needed. Since the ecosystem has emerged, it is not as good as me..."
　　 "Enjoy something?" He looked at his fingers and looked at his fingers, trying to cut his hands and dripping blood into it, allowing some species to absorb genes and quickly evolve humanoid intelligent creatures...
　　 But he thought about it and rejected it. Some resisted experimenting with people. "Remember that there are zoos in the urban area outside, secretly making fur of a few gorillas, get some gene templates..."
　　He went straight out.