Amphibious habitat is understood correctly

I think anyone is 2000, it should be A, because he must be able to live in the water and on land, but you must also have a part of it that lives in the water when you are young, and lives on land when you mature, in fact, both of these are amphibious.

According to this question, the answer that best matches the answer should be option B. Amphibians are juveniles, live in water, and breathe with ** or gills when they become adults. The answer to this option B is explained in great detail and is a very accurate and accurate description of amphibians.

The correct understanding of C of land and water 2c is that the place is that both places or environments can live in water and on land, and it can also be understood as a way.

Amphibious Chinese and Western means to live and survive, which means that this animal can live both in water and on land.

Hello classmates The answer should be option B, which is closer to the correct answer.

The adaptation of amphibians to life on land is manifested in the following aspects:

1.Respiratory system: The respiratory system of amphibians is adapted to live in water and on land, breathing through the lungs and inhaling oxygen underwater.

2.Limb structure: Amphibians have a limb structure adapted to live in water and on land, swimming in the water and crawling on land.

3.: Amphibians are soft and scaly, which prevents water evaporation and adapts to life in water.

4.Xunqing Potato Ring System: The circulation system of amphibians has changed from a single cycle to an incomplete double cycle, which can adapt to the living environment from water to land.

5.Excretory system: The excretory system of amphibians allows metabolic wastes to be excreted from the kidneys and adapts to life on land.

6.Nervous system: The nervous system of amphibians is clearly differentiated, with cerebral hemispheres and extended brains appearing in the brain, and corresponding receptors also appearing in the eyes and ears, which can be dispersed and adapted to life on land.

7.Reproductive development system: The reproductive development system of amphibians is characterized by reproductive seasonality and larval development in water, adapted to life on land.

In conclusion, the adaptation of amphibians to terrestrial dwellers is manifested in a variety of aspects, including the respiratory system, limb structure, **, circulatory system, excretory system, nervous system, and reproductive and developmental system. These adaptations allow amphibians to live in an environment that requires both water and land.

Respiratory system, limb structure, digestive system.

1. Respiratory system: The respiratory system of amphibians has the characteristics of adapting to life in water and on land, and can be buried in the core acre through the lungs to breathe in the forest, and can also be inhaled underwater through the first oxygen.

2. Limb structure: The limb structure of amphibians adapts to different environments in the water and on land, and the limbs of amphibians are relatively short and powerful, and some species also have webbed structures that can swim in the water. At the same time, the limbs of amphibians are adapted to walk and crawl on land.

3. Digestive system: The digestive system of amphibians is also adapted to different environments on water and land. The digestive system of bistonium can digest different kinds of food, such as aquatic animals and plants, and terrestrial invertebrates.

Characteristics of amphibian copian animals initially adapted to life on land:

Development of lung bai

Breathing, breathing O2 in the air with the lungs; With the change of the exhalation system, the cyclic DAO evolved from a single cycle to an imperfect double cycle.

**Initial keratinization, which prevents water evaporation to a certain extent.

Develop five-toed appendages that allow them to support body weight and crawl on land. It developed from the even-fins of the total-finned fish.

The sensory and nervous systems adapted to terrestrial life, especially the auditory organs, developed the middle ear (tympanic membrane and ossicles), and the cerebral hemispheres were completely separated.

Adaptation of amphibians to terrestrial imperfect features:

**Low degree of keratinization (only slight keratinization of the cells in the surface layer 1-2 layers) does not completely prevent water evaporation, so it cannot leave the humid environment yet.

Cannot reproduce on land and must return to the water to reproduce, the eggs are fertilized in the water, and the larvae develop and live in the water.

The five-fingered appendages are more primitive, the limbs cannot lift the body off the ground, and the movement ability is not strong. Lung breathing is not perfect, and there must also be ** assisted breathing.

Body temperature varies with the change in outside temperature. It has a dormant habit.

Answer]: Amphibians adapt to terrestrial life in terms of their structure and function: Amphibians adapt to the dry terrestrial environment, and the epidermis begins to keratinize slightly, which can partially prevent the evaporation of water in the body.

In addition to the general increase in firmness, the spine is further differentiated into cervical, torso, recommendary, and caudal vertebrae, and at the same time, adapting to the change of gravity, amphibians have developed powerful five-toed appendages to support the body. Lung respiration, but because the development of the lungs is not yet perfect, at the same time with ** as an auxiliary respiratory organ. The single cycle is changed to an incomplete double cycle; The heart changes from one atria and one ventricle to two atria and one ventricle.

Amphibians developed the middle ear, the tympanic membrane, and the ossicles. Complex environmental conditions on land have caused progressive changes in the amphibian brain, and the two hemispheres of the brain have been completely separated, and the protocerebral cortex has appeared.

The imperfection of amphibians to terrestrial life: ** only slight keratinization, which has not completely prevented the evaporation of water in the body, and the glomerular reabsorption function is poor, and although the cloaca bladder has a certain function of reabsorption of water, it cannot compensate for the water loss caused by the evaporation of water on the body surface, and cannot solve the problem of water loss well. Therefore, although amphibians land, they cannot leave the water for a long time.

This dictates that amphibians are also dependent on the humidity conditions of their surroundings and must live near water. The egg is fertilized in vitro, the larvae develop in water, the embryo does not have an amniotic membrane, and the egg can reproduce only in water. The adult lungs are not yet breathing, and they must be equipped with ** assisted breathing.

Amphibians are still ectotherms and must be subject to the temperature conditions of the surrounding environment, when the ambient temperature is 7 8, most species enter hibernation.

Early amphibians can be deity to leave the waters, very round, far away, orange blind old for a long time. （）

a.That's right. b.Mistake.

Correct answer: B

Wrong. Although it is defined as: a class of animals that can live both in water and on land.

However, this is only a general definition, and you can see that there are generally some additional characteristics when introducing this type of animal, such as adults can adapt to life on land, but reproduction and juvenile development are inseparable from water; The body temperature is not constant; Oviparous and so on.

To be precise, this name was given to this animal by taking into account its evolutionary position, that is, its important role in the evolutionary tree, that is, as an aquatic to terrestrial transitional species.

In this way, amphibians can be amphibians or may not. For example, some other animals can also be amphibian, such as crabs in arthropods and penguins in mammals, but they are not amphibians.

But in general, amphibians are amphibious (by the law of biogenesis).