Question

What are amphibians?

Answer 1

Organisms were divided into five kingdoms by R.H. Whittaker. He categorized organisms based on cell structure, nutrition mode and source, and body design. Whittaker proposes five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia.

Complete answer:
The Chordata phylum of the kingdom Animalia contains organisms that belong to the class Amphibia. These are multicellular vertebrates that can live on land as well as in water. There are approximately 3000 species in this class. They are the first cold-blooded animals to appear on the surface of the earth.
Amphibians are tetrapod vertebrates that are ectothermic and belong to the class Amphibia. Lissamphibia is the name given to all living amphibians. They live in a wide range of environments, with the majority of species inhabiting terrestrial, fossorial, arboreal, or freshwater aquatic ecosystems.
The organisms in the amphibia class have the following characteristics:
1. These creatures can live on land and in water.
2. Ectothermic animals live in a warm environment.
3. Their body is divided into two parts: the head and the trunk. There may or may not be a tail.
4. There are no scales on the skin, but it is smooth and rough, with glands that keep it moist.
5. They don't have paired fins.
6. For locomotion, they have two pairs of limbs.
7. They breathe through their skin and lungs. Gills may be visible on the outside of some adults.
8. The heart is divided into three chambers.
9. Mesonephros is a condition in which the kidneys are mesonephric. Ammonia and urea are among the excretory materials.
10. There are ten pairs of cranial nerves in them.
11. During their development, they have a lateral line.
12. The sexes are segregated, and fertilization is usually done outside the body. Salamanders, on the other hand, fertilize themselves internally.
13. A metamorphosis is a form of indirect development.
14. Water is where breeding takes place. Males do not have copulatory organs.
15. Frogs and Salamanders, are examples.

Note:
The skin of most amphibians is thin and moist, allowing them to breathe easily. Because they have a backbone, amphibians are classified as vertebrates. Food is swallowed whole by frogs. Frogs are unable to survive in saltwater. Gills are present in all amphibians, some only as larvae and others throughout their lives.