Class 11th high quality notes

The Animal Kingdom includes multicellular, heterotrophic organisms classified based on features like body organization, symmetry, coelom, segmentation, and notochord presence. Animals exhibit diverse forms of locomotion, reproduction (sexual/asexual), and adaptations. Phyla include **Porifera** (sponges), **Cnidaria** (jellyfish), **Platyhelminthes** (flatworms), **Nematoda** (roundworms), **Annelida** (earthworms), **Arthropoda** (insects), **Mollusca** (snails), **Echinodermata** (starfish), and **Chordata** (vertebrates like fishes, reptiles, and mammals). Non-chordates lack a notochord, while chordates have it. Animals play ecological roles as consumers, decomposers, and contributors to ecosystems. With levels of organization ranging from cellular to organ systems, they display remarkable diversity in habitat, structure, and function.