Transcription of CHAPTER 4 ANIMAL KINGDOM
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CHAPTER 4 ANIMAL KINGDOM
46 BIOLOGYWhen you look around, you will observe different animals with differentstructures and forms. As over a million species of animals have beendescribed till now, the need for classification becomes all the moreimportant. The classification also helps in assigning a systematic positionto newly described OF CLASSIFICATIONI nspite of differences in structure and form of different animals, there arefundamental features common to various individuals in relation to thearrangement of cells, body symmetry, nature of coelom, patterns ofdigestive, circulatory or reproductive systems. These features are usedas the basis of ANIMAL classification and some of them are discussed of OrganisationThough all members of Animalia are multicellular, all of them do notexhibit the same pattern of organisation of cells.
(Bath sponge). 4.2.2 Phylum – Coelenterata (Cnidaria) They are aquatic, mostly marine, sessile or free-swimming, radially symmetrical animals (Figure 4.6). The name cnidaria is derived from the ANIMALANIMAL KINGDOM KINGDOM 51 51 4.2.3 Phylum – Ctenophora
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