The evolution of sharks??? How sharks evolved

The evolution of sharks has been based on parallel evolution and divergent evolution.

The blue ocean covers the earth, and the sharks in it have lived on the earth for hundreds of millions of years. The ancestors of sharks can be traced back to the post-Cambrian Ordovician.

Period - If we take all the cartilaginous fish that are not ray or silver shark.

or non-ray gills are called "sharks". In the Ordovician, we have not found any fossils of jawed fishes, but early cartilaginous fishes have quietly branched out in that fertile sea.

We may be underestimating the evolutionary potential of sharks, whose ability to evolve in parallel and divergent evolution is far greater than we would expect, and many of the groups of sharks that we think of as a separate clade are in fact a parallel or polyphyletic, i.e., they are either a collection of several independent evolutionary results, or they have a very different branch within themselves.

For example, the delicate blue shark originated from the strong true shark, while the giant whale shark that swims the surface of the global ocean is actually embedded in the benthic reammouth shark family. The catshark family is a paraphyletic group that lies across the base of the order Eushark, and may actually represent the early form of the Eushark, and at the tip of the order Eushark, the monstrous hammerhead shark.

It diverges from the vicinity of the weasel shark of the family Sharkidae.

Shark Profile

Sharks belong to the subclass of vertebrate phylum Chondrichthyes plate-gills, and a few species enter freshwater, and are a group of medium-to-large marine fish that swim fast. There are 8 orders, 25 families, about 250 300 species, and about 130 species in China's waters.

The endoskeleton of the shark is composed entirely of cartilage, often calcified, but without any true bone tissue, the exoskeleton is not very developed or degenerate, the body is often covered with skin teeth (qualitative scales), the teeth are diverse, and there is hard muscle, but the membranous bone never exists, and the brain is seamless. The upper forehead is composed of palatal cartilage, and the lower forehead is composed of Mei's.

Cartilage composition. The latest research has shown that sharks contain a variety of bioactive components, such as anti-cancer factors and squalene.

Mucopolysaccharides and so on.

1.Oviparous: Generally adopted by large sharks.

Shark eggs are large and nutritious. The discharged egg is packed in a flat, cushion-shaped sheath that is added around the egg as it passes through the fallopian tubes, the outer skin of the sheath hardens when it enters the water, and each corner of the sheath has a short, hollow horn that allows seawater to enter and give the egg oxygen. There is a limited number of ovulations at a time.

The eggs are in the shape of a cloth bag or spiral, and after they are laid, they are fixed in coral reefs, seabed plants or rock crevices. The empty oocysts of the spiny shark that washed up on the shore are nicknamed the mermaid's purse.

Except for whale sharks, which can produce more than 300 at a time, the rest can produce dozens at most each time, and the least is the fox shark (thresher shark), which only produces two at a time.

3.Viviparous (placental viviparity): Fertilized eggs with horny shells develop in the uterus, and the nutrients needed for growth are obtained from the yolk sac placenta until the young sharks are almost fully formed, giving birth to dozens of eggs at a time.

Most of the sharks in the ocean are viviparous. Most sharks breed seasonally each year, with some large sharks breeding every other year. Most sharks have a gestation period of 8-9 months, and the gestation period of the white-spotted horn shark can even be as high as 24 months.

In general, large sharks produce more small sharks at a time, while small sharks do the opposite. Sharks also grow unusually slowly, not becoming sexually mature until they are 5-10 years old.

Sharks reproduce sexually. There are several ways to reproduce:

1. Oviparous type.

The egg shell is peculiar, the size and shape vary with different species, the largest is 30cm, 14cm wide, 9cm high, it is the largest egg of living fish, the smallest egg is 63mm long and 37mm wide, most of the egg shells are rectangular, and there are extended tendrils at the four corners to be wound on seaweed, stones and other objects for incubation.

2. Ovoviviparity.

Most shark fertilized eggs develop into fetuses in the mother's womb and eventually give birth to larvae. The number of fetuses produced varies from dozens to 2-3.

3. Viviparous type.

The fetus has a close relationship with the mother, the maternal uterine wall and the fetal yolk sac are connected to form the yolk sac placenta, and the mother's nutrients and oxygen enter the human fetus through the yolk sac placenta.

The shark is a social animal, he just eats some small fish, well, or nutrition to keep himself from hungry, that's it, but just eats some small fish, and then that's it, and then grows bigger and bigger.

Sharks are an ancient group, no matter how they are defined, at least for most of the dinosaur era, and survived for 66 million years after the extinction of the dinosaurs. Together with its close relative, the ray subclass and its distant relative, the silver shark, make up today's cartilaginous fishes, and they are one of the most dynamic branches of all cartilaginous fish. Sharks have lived in the oceans for hundreds of millions of years, their history will continue, these ancient fish will always be with us, and what we need to do is to protect these creatures that have come from time immemorial.

Summary. Dear, the hungry fish shark is a fish that has undergone a long evolutionary process, and they have many unique evolutionary advantages. For example, their bodies are ideal for swimming and hunting quickly in the ocean.

Their dorsal and caudal fin structures allow them to easily control their direction and speed. In addition, their sense of smell and hearing organs are very sharp, which allows them to easily locate and catch their prey in the ocean. In addition, hungry sharks also have a strong immune system and reproductive abilities, which can help them better adapt to various environments.

They can also blend in with their surroundings by changing their color, helping them hide and make it easier to evade predators. In short, the evolution of the Hungry Fish Shark has given them excellent survivability and competitiveness in the ocean, thus helping them to gain an edge in the fierce competition.

Hungry Fish Shark What is the use of the evolution of fish species evolution.

Dear, the hungry shark is a fish that has undergone a long evolutionary process, and they have many unique evolutionary advantages. For example, their bodies are ideal for swimming and hunting quickly in the ocean. Their dorsal and caudal fin structures allow them to easily control their direction and speed.

In addition, their olfactory and auditory organs are very sharp, which allows them to easily locate and catch their prey in the ocean. In addition, hungry sharks also have a strong immune system and reproductive abilities, which can help them better adapt to various environments. They can also blend in with their surroundings by changing their color, helping them hide and make it easier to evade predators.

In short, the evolution of the Hungry Fish Shark has given them excellent survival and competitiveness in the oceans, thus helping them to gain an edge in the fierce competition.

What does evolution do.

Hungry sharks have evolved to be able to swim faster and chase their prey. 2.Acceleration:

The Hungry Shark has evolved to increase its bite power, increase damage to its prey, and kill its prey faster.

What does it mean to be above level 11.

Dear, in the aftermath game, level 11 or above refers to the higher level after level 11, such as level 12, level 13, etc., the level can be continuously improved, and finally reach the full level. This level-up setting is designed to motivate players to improve their combat abilities and better enjoy the game by constantly exploring and evolving. However, it should be noted that this is only a game setting, and it does not mean that creatures will evolve in the same way in reality.

<> "Hungry Shark: Evolution" is a top-level mobile game developed by Ubisoft's FGOL studio, and the Android version is exclusive in China by the well-known mobile game publisher Palmfun Technology**. The glory and survival of the shark are inviolable, and it is up to you to thwart the enemy's plot to attack.

The mysteries of the deep sea have always been the dream of human exploration. Although there are all kinds of magical creatures at the bottom of the sea, of course, there are also fears of the unknown. Ubisoft's FGOL studio developed a large-scale 3D adventure action mobile game "Hungry Shark:".

"Evolution" describes such a deep sea for players, and the horror is constant.

Hungry Sharks: How Evolved Was? Hungry Shark:

Is evolution fun? Today I will explain to you the Hungry Shark: Evolution High Score Skill Strategy, and those who don't know it should hurry up and follow the rhythm to see what wonderful content is presented to you today!

Game Description: Hungry Shark Evolution is a fast-paced game of the jungle, the game can be understood on a certain level as a game of eating small fish with big fish, but in this game, humans are also part of the food chain, and they are also the shark's favorite food.

1。Don't be picky eaters, eat all the sizes, don't think about eating big fish to get a high score, and small fish to get a low score. The hunger level of a shark is related to the distance it travels, and it is easy to starve to death if it is not fed in time. So don't be a picky eater, it's good for both sizes.

2。Pay attention to the dangerous targets around you, and many times the player ends the game not starving to death, but encountering some fish, jellyfish, and submarine fishing boats that can attack sharks. Players should pay attention to their surroundings while playing and try to avoid being attacked. 3。

Don't speed up easily, continue to use the acceleration will cause the shark's hunger to increase, players should pay attention to the relationship between the two, don't speed up easily, waste shark energy. 4。There are many props in the game that can be used by players, and these props can help players better fish and defend against attacks, and increase survival.

5。Decisively upgrade the shark's abilityIn the game, players can use gold coins to upgrade the shark's speed, HP, and bite range, which can greatly improve the shark's hunting ability. Players should level up as much as possible while playing the game.