Why can t fish live in the air?

Fish have the characteristics of being suitable for living in water: the color of the body of the fish is the protective color of the fish. The body is streamlined, large in the middle and small at the end.

The surface of the body is covered with scales, which protect the body; There is a layer of mucus on the surface of the scales, which reduces the resistance of the water when swimming. There is a lateral line on both sides of the body, which is connected to the nerve, which is mainly used to determine the direction and sense the flow of water. The body of a fish has pectoral fins, dorsal fins, pelvic fins, and caudal fins, which are the locomotor organs of the fish in the water.

Fish breathe with gills. There is a swim bladder in the body, the main role is to regulate the specific gravity of the body, the swim bladder in the coordination of the fins, can make the fish stay in different water layers.

Fish belong to the lower animals of vertebrates because they cannot live without water all their lives, breathe with gills, heart-atrium-ventricles, a circulatory route, and arterial and venous blood are mixed; In particular, the reproduction of fish is naturally hatched by in vitro fertilization, and the body temperature is not constant.

The role of the fin: The dorsal and anal fins mainly play a stabilizing and balancing role when moving. The tail fin works with the muscles on the side of the body to propel the fish and control the direction.

The main function of pectoral and pelvic fins is to maintain the balance of the fish, cooperate with the body of the fish, and adjust the lifting of the fish. However, pectoral fins are more versatile than pelvic fins, and they can be used like oars to move the fish forward slowly.

Because the gills of a fish are only adapted to absorb oxygen from the water and cannot absorb oxygen from the air, it can only live in the water.

If the fish are flying in the sky.

Is there still daylight then?

There are more fish in the sea than all the creatures on land combined.

Fish breathe less air.

If flying in the sky.

That proves that the fish has escaped the trap of its gills.

Dramatically increases lung capacity.

All the fish ran out and took a big breath.

I doubt that the oxygen produced by photosynthesis can be ***.

At that time, will we have a collective plateau reaction?

<> fish can live in water because they breathe with their gills and can take in oxygen from the water. When water flows through, the capillaries in the gill filaments can exchange gases with the water to obtain oxygen. Once out of the water, the gill filaments stick together, causing it to be unable to take in oxygen, and it dies.

However, some fish have auxiliary respiratory organs and can survive out of water.

1. Because the fish breathes with gill yards, the gills of the fish are only adapted to absorb oxygen from the water, but cannot absorb the oxygen in the air, so the fish cannot leave the water to survive on land. Stalls.

2. Secondly, fish have all the prerequisites for life in the water:

1) The color of the body of the fish is the protective color of the fish;

2) The body is streamlined, large in the middle and small at the end, and the surface of the body is covered with scales to protect the body; There is a layer of mucus on the surface of the scales, which reduces the resistance of the water when swimming.

3) There is a row of lateral lines on both sides of the body, which are connected to the nerves, mainly for determining the direction and sensing the water flow;

4) The body of the fish has pectoral fins, dorsal fins, pelvic fins and caudal fins, which are the locomotor organs of the fish in the water;

5) There is a swim bladder in the body, the main role is to adjust the specific gravity of the body, the swim bladder can make the fish stay in different water layers under the coordinated lifting of the fins.

3. All life on the earth evolved from water to land, so water is the source of life. In particular, whales use their lungs to breathe, but they must also live in the water, because whales are large and can crush their lungs and internal organs in a few minutes after leaving the water, so whales can easily suffocate to death after being stranded.