Question

Explain how $Animals$ in $Vertebreta$are $Classified$ into further $Subgroups$ (no copy n paste criteria! )
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Answer 1

Answer:

Animals in Vertebrata are classified into five classes: ... These animals have a dual mode of life. In the larval stage, the respiratory organs are gills, but in the adult stage, respiration occurs through the lungs or skin. They lay eggs in water.

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Answer 2

Answer:

Vertebrates are classified into further subgroups on following bases:

1. Pisces: Typically lives in water. It has a streamlined body. Locomotion is carried out with the help of muscular tail. Body is covered with scales. Paired gills are present; which can breathe oxygen dissolved in water. Animals are cold blooded. They lay eggs. Possesses 2 chambered heart.

2. Amphibia: These animals can live both, on land and in water. The animals breathe through skin when in water and through lungs when on land. Animals are cold-blooded.

3. Reptilia: Crawling movement is observed in animals classified under Reptilia. Scales are seen. Most of the reptilians have three chambered heart but crocodile has four-chambered heart.

4. Aves: These animals are evolved for flight. The body is covered with feathers. Wings are modified from fore-limbs. Animals are warm blooded. Possesses 4 chambered heart. Bones are hollow (pneumatic); which assists in flying. This class comprises of all birds.

5. Mammalia: Hair covers the body. Sweat and sebaceous glands are observed. Mammary glands are present in females and are used for nourishing the young ones. Most of the animals of this class are viviparous. Some of the mammals lay eggs and are called as oviparous.