Question

В чём отличие строения скелета земноводных и рыб?

Answer 1

1. В позвоночнике рыб - 2 отдела, у земноводных - 4 отдела. 
2. У рыб есть рёбра, у амфибий редуцированы. 
3. У рыб нет шейного отдела, череп прикреплён неподвижно к позвоночнику, у амфибий - шейный отдел представлен 1 позвонком. 
4. У рыб - скелетом грудных и брюшных плавников являются лучи, у земноводных есть скелет передних и задних конечностей с поясами. 
5.У земноводных (лягушки) есть каракоиды (вороньи кости) , нижняя челюсть - единое целое с черепом. 
6. У рыб скелет значительно тяжелее, чем у земноводных. 

Answer 2

Рыбы не могут ходить по суше. А земноводные могут. В связи с этим и произошло изменение в строении скелетов.

Answer 3

Difference in Skeletal Structure Between Amphibians and Fish

The skeletal structure of amphibians and fish differs significantly due to their distinct evolutionary paths and habitats.

Amphibians: Amphibians, such as frogs and salamanders, have a skeletal structure that is adapted for both aquatic and terrestrial life. Their skeletons are characterized by: - Vertebral Column: Amphibians have a vertebral column that consists of distinct vertebrae, which allows for flexibility in movement on land and in water. - Limbs: They have limbs that are adapted for both swimming and walking. The bones in their limbs are designed to support their weight on land and aid in swimming in water. - Skull: The skull of amphibians is relatively flat and broad, allowing for a wide range of movement and flexibility in catching prey and navigating their environment.

Fish: Fish, on the other hand, have a skeletal structure that is specialized for life in water. Their skeletal features include: - Cartilaginous or Bony Skeleton: Fish can have either a cartilaginous or bony skeleton. Cartilaginous fish, such as sharks, have skeletons made of cartilage, while bony fish have skeletons made of bone. - Fins: Fish have fins supported by rays, which are composed of bony or cartilaginous structures. These fins aid in propulsion and stability in water. - Gills: The skeletal structure of fish includes gill arches, which support the gills and allow for efficient extraction of oxygen from water.

In summary, the skeletal structure of amphibians is adapted for both aquatic and terrestrial life, with features such as a flexible vertebral column and versatile limbs. In contrast, fish have specialized skeletal adaptations for life in water, including fins, gills, and either cartilaginous or bony skeletons.

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