Qiu worm has nothing special, what does it rely on and what in the soil, what does it do to complete

Earthworms do not have special respiratory organs, and rely on the moist body wall and the capillaries in the body wall to exchange gases to complete respiration.

Each animal will have its own corresponding characteristics, but all existence is reasonable, don't worry about how to breathe, people have their own way.

They have their own respiratory organs.

It requires less oxygen.

Earthworms do not have special respiratory organs.

The air in the loose soil against the body wall.

Gas exchange is carried out to complete the respiration.

Earthworms rely on secretions to moisten the surface of the body to complete respiration, so it is common to see earthworms crawling to the ground on rainy days, because when it rains, the oxygen in the soil decreases, so they come to the ground in order to breathe.

Because there are many breathing holes on the surface of the earthworm, and the soil is very soft, it can achieve respiration.

Earthworms rely on ** to breathe, have no respiratory organs in the soil, and use ** to exchange with the outside world.

This animal can breathe through the capillaries on its body, which are annelids and do not have a nose.

Answer B analysis: The knowledge point tested in this question is the breathing process of earthworms When answering, you can start from the breathing process of earthworms

Answer: The body wall of the earthworm is densely covered with capillaries, and the oxygen in the soil is first dissolved in the mucus on the body surface, and then seeps into the body wall, and then enters the capillaries of the body wall The carbon dioxide in the body is also discharged from the body surface through the capillaries of the body wall, and the breathing of the earthworm depends on the body wall that can secrete mucus and always remain moist Mammals use their lungs to breathe, fish live in water and breathe with gills, and domestic pigeons use air sacs and lungs for double breathing

Comment: The key to answering such questions is to understand that the gas exchange of earthworms is done through the body surface

The body wall of the earthworm is densely covered with capillaries, and the oxygen in the soil is first dissolved in the mucus on the body surface, and then penetrates into the body wall, and then enters the capillaries of the body wall The carbon dioxide in the body is also discharged from the body surface through the capillaries of the body wall, and the breathing of the earthworm depends on the body wall that can secrete mucus and always remain moist Mammals breathe with lungs, fish live in water and breathe with gills, and domestic pigeons use air sacs and lungs for double breathing

Earthworms breathe oxygen in the air, and oxygen first dissolves in the mucus of the body wall, and then seeps into the blood in the capillaries in the body wall, and the carbon dioxide in the blood is also excreted through the body wall

So the answer is:

Earthworms breathe with warm and moist body walls, like dark and damp environments, always burrow around in or limb soil, feed on organic matter in the soil, and digest the feces that quietly come out of the hands are rich in nitrogen, phosphorus, potassium and other nutrients", which can improve soil fertility.

So the answer is: organic matter.

Answer B analysis: The knowledge point tested in this question is the breathing process of earthworms When answering, you can start from the breathing process of earthworms

Answer: The body wall of the earthworm is densely covered with capillaries, and the oxygen in the soil is first dissolved in the mucus on the body surface, and then seeps into the body wall, and then enters the capillaries of the body wall The carbon dioxide in the body is also discharged from the body surface through the capillaries of the body wall, and the breathing of the earthworm depends on the body wall that can secrete mucus and always remain moist Mammals use their lungs to breathe, fish live in water and breathe with gills, and domestic pigeons use air sacs and lungs for double breathing

Comment: The key to answering such questions is to understand that the gas exchange of earthworms is done through the body surface

**Earthworms do not have special respiratory organs, and under normal circumstances, they mainly rely on the moist body surface to complete gas exchange, so they must go to the ground to ventilate when it rains, and earthworms are rarely seen in sunny weather, because they must keep their bodies moist.

Gas exchange of earthworms:

Air (mainly oxygen) > moist body surface, capillaries, in vivo, capillaries, moist body surface, air (mainly CO2).

Organisms must adapt to the environment to survive, earthworms live in the soil, and the long cylindrical shape of the body can reduce the resistance when drilling into the soil; The bristle structure on the surface of the body helps them to crawl in the soil; The presence of mucus on the body surface can complete respiration, and at the same time has a lubricating effect and reduces the friction of crawling in the soil, indicating that earthworms are adapted to burrow life in the soil, and also indicating that the survival of organisms depends on a certain environment

So the answer is: bristles; Mucous; Depends on a certain environment