Are mollusks better suited to survive in water? Not as big as a large vertebrate? Except for octopus

The bones of mollusks become very thin due to the tremendous water pressure of the deep-sea environment; And it's easy to bend; The muscle tissue becomes particularly flexible and the fibrous tissue becomes surprisingly fine. What's even more interesting is that mollusk skin becomes just a very thin membrane that fills the physiological tissues in the body with water and maintains a balance of stress inside and outside the body. This is why deep-sea molluscs are not squashed under such enormous pressure conditions.

Not to mention world domination, even in the ocean world, this mollusk is a speck of dust in front of giant creatures that are several times or even dozens of times larger than it

From the current exploration and research of biological evolution, the primary stage of biological development is "aquatic", and gradually develops to the land, from the aquatic "lower animals" to the terrestrial "higher animals" to evolve and develop, according to different environments, different species have evolved, or mollusks, large vertebrates, at present, they have their own more suitable living environment, snails and snails are mollusks, snails are not suitable for raising in water; Fish are also vertebrates, and whales are "large vertebrates", they are all more adapted to survive in the water; All living things have their own evolutionary and adaptable environments, and there seems to be no conditions for comparison.

Except for octopuses? Could it be that octopuses are better suited to live on land?

Summary. Hello dear. Invertebrates are more suitable for living in the sea.

Hello dear. Invertebrates are more suitable for living in the sea.

Okay, can you give me two examples, one for vertebrates and one for invertebrates.

Among the marine invertebrates, foraminifera, molluscs, and hexaspotic corals are the main ones.

Is it all in the ocean?

That's right. Vertebrates: whales, dolphins, sharks. Invertebrates, corals, octopuses.

Features don't bother you.

Invertebrates are more suitable for complex and changeable living environments in the sea.

Good. As far as the phylum of living animals is concerned, it can be roughly divided into more than 30 phyla (taxonomists still make new discoveries, revisions and synthesies on the highest taxa from time to time), of which there are as many as 8 phyla that live freely in the ocean, and 14 animals are only distributed in the ocean; There are 14 phylum distributed in freshwater, but the animals that do not have a whole hall are only produced in freshwater. There are only 10 phylum of land land, and one of them is an animal that is only produced on land, showing that the sea is the mother of life.

In addition, there are many phyla of marine invertebrates that have few species and specific morphologies, and these species are themselves the result of evolutionary natural selection. Thank you.

1. Octopuses are mollusks and have no bones (all bones are degenerate).

2. The octopus is a cephalopod with a total of 8 brachiopods that grow on the head.

3. Octopuses are the most intelligent of all invertebrates.

4. Octopus** contains highly developed pigment-containing cells, which can change body color very quickly. The body color of the octopus can be used as a protective color, and it is said that it can also reflect the mood of the octopus.

5. The octopus relies on inhaling water into the mantle membrane and expelling the water from the body through a short funnel-shaped body tube for respiration. When an octopus is frightened, it squirts water from its body tubes and quickly moves in the opposite direction by means of a hydrodynamic jet to avoid danger.

6. When the octopus encounters danger, it will spray an ink-like substance as a smoke screen to avoid danger.

1. Aquatic vertebrates: grass carp, crucian carp, eel, silver carp, catfish.

2. Aquatic invertebrates: octopus, squid, squid, shrimp, crab.

Vertebrates (vertebrata) refer to animals with vertebrae and are a subphylum of chordates. The largest number, the most complex structure, and the highest evolutionary status, evolved from mollusks.

Invertebrates are animals that do not have a vertebral column on the dorsal side, and they are the original form of animals. Its species account for 95% of the total number of animal species. It is distributed all over the world, and there are about 100 million species in existence.

Aquatic vertebrates: grass carp, crucian carp, eel, silver carp, catfish.

Aquatic invertebrates: octopus, squid, squid, shrimp, crab.

It is embodied in the following aspects:

1. Fish have gills and can breathe in water.

2. The body shape of the fish is streamlined, which can reduce resistance.

3. There are swim bladders in the body of the fish, which can keep the fish in the water layer suitable for survival 4. The fish has many differentiated fins that play different roles.

5. The fish has a lateral line, which can balance the osmotic pressure in the body and play a role in sensing the water flow 6. Most of the back is dark and the abdomen is light, which is a protective color 7. Strong reproductive ability.

Fish live throughout their lives in seawater or freshwater, and most of them have a body shape and fins that are suitable for swimming. Breathe with gills and hunt with the upper and lower jaws. A beating heart is divided into an atrium and a ventricle.

The blood circulation is single-circulation. The appearance of vertebral vertebrae and heads allowed the fish class to develop and evolve into a group of vertebrates that are best adapted to life in the water.

3. For the time being, all the powerful animals on the earth are vertebrates, and it is often difficult for invertebrates to get rid of the shackles of the ocean. In fact, we say that the powerful creatures that are framed are all fed to animals by chickens, and they are unfettered to animals, and it is precisely because of their weight that it is difficult to get rid of the shackles of the sea, so it is said that they cannot survive on land, and there are many restrictions.

In fact, for us, the transformation of organisms from invertebrates to vertebrates also provides more diverse choices for biological evolution, helping life, better adapting to the regional environment, and better survival, and although after a long evolution, invertebrates have also adapted to the earth's environment, but in terms of comprehensive ability, there are still many physical constraints, so the living space is relatively less than that of vertebrates.

The greater advantage of vertebrates over invertebrates is the flexibility of having brains. Vertebrates can use their brains to control their limbs and torsos. Invertebrates, on the other hand, can only crawl.

Vertebrates are better able to move around the water freely. With the complete evolution of the group, vertebrates can stand and fly, which invertebrates cannot compare.

Invertebrates can only be a soft one, unable to walk upright, can only slowly wriggle Vertebrates can walk upright, have greater strength, but also have stronger hands-on ability, can have the strength to resist danger from the outside world.

In fact, for us, vertebrates in their natural state are much more hesitant than invertebrates, they must be more adaptable. The most important thing is to be able to survive on Earth and get rid of the constraints of Earth's gravity, so the common reason why it is more suitable for survival is also the following survival advantages.

Test Center: Classification of Animals Special Topic: Analysis:

There are many kinds of animals in nature, we need to classify animals, and the classification of animals should not only compare the external morphological structure, but also compare the internal structure and physiological functions of animals According to this answer, according to whether there is a vertebrate in the animal's body, animals can be divided into vertebrates and invertebrates, and the common feature of vertebrates is that there is a vertebral column composed of vertebrae in the body The common feature of invertebrates is that there is no vertebral spine in the body Therefore, the selection:d Comments: Key points:

Vertebrates and invertebrates are classified based on the presence or absence of a spine in the body

Classification of animals, in addition to comparing the external morphological structure, but also to compare the internal structure and physiological functions of animals According to whether there is a vertebrate in the body, animals can be divided into two categories: vertebrates and invertebrates, invertebrates do not have a vertebral column in their bodies, such as polyps, spiders, etc. Vertebrates have vertebral spine composed of vertebral bones, such as chickens, dogs, etc

So the answer is: polyps; Spider; Chicken; Dogs